Wednesday, March 3, 2010

A personal commentary -

California Bee Keeping – is a Year Round adventure with nature – a crapshoot / expensive and frustrating, rewarding and enjoyable, hard labourious days and short nights.

The honey flow is NOT year round as many think – the honey ONLY flows IF there has been rain. One may see an abundance of flowers everywhere and think HONEY but without water there is none. RAIN = NECTAR = HONEY. It is that simple. No nectar NO HONEY>

Bee keeping techniques haven’t really changed all that much – the pests, the diseases, the travel, the expenses, and the return on the work – all that has changed. With the oncoming of the Africanized bee and the lack of understanding of the situation – the fear that caused so many ‘city fathers’ to ‘dissuade’ local bee keepers from keeping hives in backyards cut the control factor of marauding bees which could have been eradicated in part by informed bee keepers…. So instead we are inundated with this very territorial creature – one never quite knows when one’s hive has been ‘taken over’ as it were. The once backyard beekeeper without proper clothing no longer exists. Gloves, boots, suits one cannot do without here in California.

And importation issues of bringing in European bees (a milder creature) has stifled the gene pool expansion, which has diminished at an alarming rate here in the United States. Nature seems to be fighting back with the issue of sterility in males – both animal/insect and human with a rise of 18% in humans – something that is already seen in the queen bee who has to be replaced 2 and 3 times a year as she is continually superseded, or killed on sight/site or simply flies away.

The lack of education in schools of basic agriculture has created a widespread ignorance of just how important the bee is to pollination – no bee to pollinate the almond = no almond; strawberries would be white and hard…. (THE SILENCE OF THE BEE – video) ought to be a source of information for both the media and the layman as without the bee man is no long on this planet. Over population has put an impossible increase on food output, causing agriculture to change its focus to meet demand resulting in mono-crops (where once there was diversification ie. cotton, alfalfa etc there is either one or the other or none; hence nothing for the bee to live on - cotton is genetically altered and is deadly to the bee while alfalfa is slowly, though in some parts, all too quickly being replaced by switch grass, originally planted as bio fuel but replaced by corn, another genetic food deadly to bees so switch grass is now fed to cattle - there is no flower it is simply a fast growing grass with health benefit for animals still up for debate. Pesticides whether currently used or not have caused systemic damage to ground and water supply, genetically engineered product, an increase in air and noise pollution, viruses, pests, mites, transportation issues….. An endless array of living in the 21st Century.

Tracheal -- the vampire mite

Ohio State University Extension Fact Sheet

OARDC/The Ohio State University

Horticulture and Crop Science

1680 Madison Ave., Wooster, OH 44691


Controlling Tracheal Mites in the Bee Hive

HYG-2164-97

Dr. James E. Tew

Dr. Diana Sammataro, Post-doctorial Researcher

Mr. David Heilman, University Apiarist

E-mail Tew.1@osu.edu

Tracheal mites (Acarapis woodi) were first reported in the United States from Texas in 1984. By 1992, severe colony losses due to tracheal mites were recorded throughout Ohio. Tracheal mites are microscopic parasites that live in the breathing tubes of adult honey bees where they feed on bee blood. Suffering colonies have dwindling populations, do not cluster well, and often die in the winter, frequently leaving behind large amounts of honey. Infested adults may act irritated or disoriented. Weak adults may be found crawling aimlessly near the entrance of the hive. Unfortunately, tracheal mites cannot be positively identified without dissecting the bees under a microscope. Two materials, vegetable oil patties and menthol, are useful in suppressing tracheal mite populations. Eradicating mite populations is not practical. Since any material only suppresses mite populations temporarily, beekeepers should be prepared to contend with tracheal mite infestations indefinitely.

Vegetable Shortening Patties

Precautions: As a matter of principle, don't have patties, or any other medications on during a nectar flow. Always follow label instructions.

Tracheal Mite


Product: Vegetable Shortening (eg. Crisco™)

Ratio: One part vegetable shortening to 2 parts white granulated sugar. Patty size should be about one-half pound (size of a hamburger).

Exposure Time: Continuous (except during nectar flow). Replace as often as needed. Most effective during spring and autumn.

Location within the colony: On broodnest top bars.

Comments and Suggestions:

  1. Vegetable shortening appears to disrupt the life cycle of the tracheal mite, thus suppressing mite populations.
  2. Vegetable shortening patties are considered to be more effective in controlling mites in Ohio than menthol. However, menthol is still useful.
  3. Vegetable patties with terramycin is useful in controlling American Foulbrood. Refer to the factsheet on American Foulbrood for specific recommendations.

Menthol

Menthol is available in bulk quantities or in 1.8-ounce (50 grams) packets from most major bee suppliers. Treat only over-wintered colonies having no surplus honey intended for human consumption. Colonies should be treated in the fall or early spring when daytime temperatures are expect to be above 60°F but not over 95°F. Treatment must end one month before the first nectar flow to avoid contaminating marketable honey. Use one menthol pact per hive, on top bars in temperatures up to 80°F. Above 80°F, place the packet on the bottom board. Treat for 14 to 28 days with an entrance-reducer on the hive. Replace the menthol as needed during the treatment period.

Precautions: Treatments should not be in colony 4 weeks prior to honey flow. Allow vapors a few minutes to dissipate before working a treated colony. When stored, menthol crystals should be tightly sealed and refrigerated.



Product: Pure Menthol Crystals

Treatment: 1.8 oz (50 grams) packet of menthol crystals in a porous bag, such as a folded paper towel.

Rate: One 1.8 oz packet per average 2-story colony.

Number of Colonies per treatment: One (average 2-story colony).

Location within Colony: Above 8O°F, place crystals on bottom board, Below 8O°F, place crystals on top of frames in top supers.

Treatment Time: Spring preferably or autumn secondly

Treatment Duration: 14-28 days with entrance reduced, replace crystals as needed.

Comments and Suggestions: Menthol vaporization is temperature dependant. At temperatures above 7O°F, vaporization proceeds quickly; below 7O°F, vaporization proceeds more slowly. In essence, menthol treatments could stay on colonies anytime the temperature is high enough and there is no nectar flow in progress; however, this practice may be cost and labor prohibitive.

Results of Research: Using Essential Oils for Honey Bee Mite Control

West Virginia Unniversity

Extension Service


Jim Amrine, Bob Noel, Harry Mallow, Terry Stasny, Robert Skidmore
(Last Updated: December 30, 1996)

We have found that several essential oils can either kill, or adversely affect varroa mites.

Essential Oils have Two Modes of Action:

1) Toxicity by direct contact:
When varroa mites contact essential oils such as wintergreen, patchouli, tea tree oil, et al., mixed into oil or grease, they are killed on contact--usually within a few minutes.

2) Impaired reproduction via feeding syrups containing essential oils:
When varroa mites feed on larvae that contain essential oils, their reproduction is interrupted. If the oil is strong enough, the females are unable to lay eggs. If the oils are in lower concentration, eggs are layed, but development of immature mites is delayed; young mites do not reach maturity before the bees emerge from the cell; consequently, the immature mites die.

Involvement of Essential Oils in Impaired Reproduction of Varroa Mites: Syrup containing the essential oils is fed at the hive entrance or in the broodnest. Many bees feed on the syrup and pass the essential oils around by trophalaxis (adult bees sharing their food reserves). The syrup and essential oil is ingested by nurse bees and enters the communal food in the crop and passes into the milk glands. When the nurse bees feed larvae, the essential oils are in the bee milk and communal food and are ingested by the larvae. Thus, when female varroa mites feed on treated larvae or larval food at the bottom of the cell, they ingest the essential oils which adversely affect their reproduction. The probable mechanism is interference with enzymes in the complex gestation (especially in the production of nutrients and new proteins) of the oocyte and embryo-larva of the varroa mite. Research needs to be conducted to verify this hypothesis and to verify the presence of the essential oils in bee larvae and ultimately, in the female varroa mites.

Impaired reproduction is not observed when canola oil, mineral oil, or shortening (eg., Crisco, a vegetable lard) containing essential oils are delivered to the hives. The fats and greases do not enter the food chain as readily as syrups, and the amounts of essential oils ending up in larval food or in the larvae themselves are inconsequential. Thus, there is no interruption of the development of mite eggs or of immature varroa mites. The mites that directly contact these materials rapidly die; but others are able to escape the essential oils in grease or canola oil by entering cells of mature larvae that are about to be capped, or by moving onto displaced nurse bees (see below, "Recent Findings") near the top of the colony, where the grease patties and tracking strips are not placed. We found that putting paper towels soaked in canola + essential oils in the tops of colonies from July to September, kills the varroa mites residing on the displaced nurse bees which congregate in the upper supers of large colonies.

Feeding of sugar syrup with essential oils at the entrance, or in the brood nest, places the essential oils into the food chain and prevents oviposition by female mites or retards the development of immature mites in capped larval/pupal cells.

We had several colonies that were treated with tracking strips and grease patties only, and we saw resurgence of varroa mites, especially when bee populations were at their peak, lots of brood was present, and when the bees occupied many supers as well as two brood chambers. However, we also had several colonies that were treated with the tracking strips and grease patties, and were continually fed syrup + essential oils at the entrance; in these colonies very few varroa mites were found. Those few that were found appeared to have come into the colonies on drifting bees.

VARROA MITES INFESTING HONEY BEE COLONIES

by Ric Bessin, Extension Entomologist
University of Kentucky College of Agriculture

Varroa mites were first reported in Kentucky in the Bluegrass region of the Commonwealth in 1991. They have spread to and become a major pest of honey bees in many states since their introduction into Florida in the mid 1980's.

Varroa MiteVarroa mites are external honeybee parasites that attack both the adults and the brood, with a distinct preference for drone brood. They suck the blood from both the adults and the developing brood, weakening and shortening the life span of the ones on which they feed. Emerging brood may be deformed with missing legs or wings. Untreated infestations of varroa mites that are allowed to increase will kill honeybee colonies. Losses due to these parasitic mites are often confused with causes such as winter mortality and queenlessness if the colonies are not examined for mites.

The adult female mites are reddish-brown in color, flattened, oval, and measure about 1 to 1.5 mm across. They have eight legs. They are large enough to be seen with the unaided eye on the thorax, most commonly, and on the bee's abdomen. Their flattened shape allows them to hide between the bee's abdominal segments. This mite is often confused with the bee louse, but the bee louse has only six legs, is more circular in shape, and is slightly larger.

Mites develop on the bee brood. A female mite will enter the brood cell about one day before capping and be sealed in with the larva. Eggs are laid and mite feed and develop on the maturing bee larva. By the time the adult bee emerges from the cell, several of the mites will have reached adulthood, mated, and are ready to begin searching for other bees or larvae to parasitize. There is a preference for drone brood. Inspection of the drone brood in their capped cells will often indicate whether or not a colony is infested. The dark mites are easily seen on the white pupae when the comb is broken or the pupae are pulled from their cells.

Mites spread from colony to colony by drifting workers and drones within an apiary. Honey bees can also acquire these mites when robbing smaller colonies. It is best to isolate captured swarms, package bees, and other new colonies from other colonies and examine them for mites before placing them in an apiary.

Early detection of low levels of mite infestations is key to its successful management. While they can be spotted during colony inspection if present in high numbers, this tends to only identify larger infestations. There is a product available, Apistan, that will kill the mites and cause the mites to drop from the bees. Two strips should be hung in the brood nest area of the colony for approximately 4 weeks. This is to be used with sticky paper and a fine-mesh screen on the bottom board of a colony to capture any mites that may have been present. A considerable amount of cell cappings and other debris will also collect on the sticky paper, so it is best to inspect the sticky paper carefully for mites after removal. This method is able to detect low level infestations. Apistan strips are available from most of the large beekeeping suppliers and can be used both for detection and treatment of varroa infestations.

If a colony is found to be infested, all colonies at the site should be treated for mites with Apistan strips in the same manner. These strips contain the miticide fluvalinate and are not to be used during honey flow, or when there is surplus honey present in the colony that may be removed for human consumption at a later date. Therefore, late fall, after removal of surplus honey, or early spring, prior to honey flow, are the best times to treat for varroa mites.

Always carefully follow all label instructions with regard to the storage, use and disposal of pesticides.

Revised: 10/01

CAUTION! Pesticide recommendations in this publication are registered for use in Kentucky, USA ONLY! The use of some products may not be legal in your state or country. Please check with your local county agent or regulatory official before using any pesticide mentioned in this publication.

Tuesday, March 2, 2010

Doing the BEE Dance

Stop dancing! - (National Geographic)

Bees do their famous waggle dance when they want to tell hive mates where to find a good source of food and other resources. But what do they do when they discover that their co-workers may be buzzing off into a trap, such as a spider lurking at the food source?

They break up the waggle dance by butting their heads into the bees dancing, according to research published yesterday in the journal Current Biology.

stop-signal-bee-photo.jpg
The waggle dancer (at center with yellow and pink paint marks) is frozen when receiving a stop signal from a bee marked "S" to her left.

Photo courtesy of James Nieh

A biologist at the University of California at San Diego has discovered that honey bees warn their nest mates about dangers they encounter while feeding with a special signal that's akin to a "stop" sign for bees, the university said in a news statement.

The discovery resulted from a series of experiments on honey bees foraging for food that were attacked by competitors from nearby colonies fighting for food at an experimental feeder, the university explained. "The bees that were attacked then produced a specific signal to stop nest mates who were recruiting others for this dangerous location."

honey-bees-picture.jpg
Honey bees use a waggle dance to communicate the location of food and other resources. Attacked bees directed "stop" signals at nest mates waggle dancing for the dangerous location, scientists say.

NGS stock photo by Bianca Lavies

James Nieh, an associate professor of biology at UCSD who conducted the experiments, said this peculiar signal in bee communication was known previously by scientists to reduce waggle dancing and recruitment to food, but until now no one had firmly established a "clear natural trigger" for that behavior.

"The stop sign is a brief vibrating signal made by the bee that lasts for about a tenth of a second with the bee vibrating at about 380 times a second. It is frequently delivered by a sender butting her head into a recipient, although the sender may also climb on top of the receiver," Nieh said.

Bee researchers originally called it a "begging call," because they believed the signaling bee made it to obtain a food sample from the receiver, UCSD said.

"But Nieh discovered in his experiments that one trigger for this signal---which caused the waggle dancers to stop and leave the nest---was attacks from bee competitors and simulated predators. The more dangerous the predator or competitor, he found, the more the stop signals bees produced to stop other bees from recruiting to that location," UCSD said.

"This signal is directed at bees who are recruiting for the dangerous food location and decreases their recruitment," explained Nieh. "Thus, fewer nest mates go to the dangerous food site. This is important because an individual experiences danger and stops recruiting, but the stop signal enables her to 'warn' nest mates who have not yet experienced danger and are still recruiting. The end result is that the colony will reduce or cease recruitment to the dangerous food patch in proportion to the danger experienced."

Nieh found in his experiments that during aggressive food competition, attack victims significantly increased their production of stop signals to nest mates, some by more than 40 times. Bees foraging for food that attacked other bees or experienced no aggression did not produce stop signals. But bees exposed to a "bee alarm pheromone" increased their stop signaling by an average of 14 times. Those whose legs were mechanically pinched in a simulated bite increased their stop signals by an average of 88 times.

bees-at-feeder-photo.jpg
Honey bees from different colonies fight for space at a crowded feeder.

Photo cortesy of James Nieh

Nieh said that cooperation within and between cells in an organism relies upon positive and negative feedback. "Superorganisms," such as honey bees, are like a multi-cellular organism because each individual bee, just like a body cell, acts for the good of the whole, the colony. Superorganisms use many types of positive feedback signals, but there are few known examples of negative feedback signals.

What's interesting to biologists about the discovery of the stop sign, Nieh said, is that it's an example of a negative feedback, in which the colony's actions are stopped for the good of the colony.

"This is only the second example of a negative feedback signal ever found in a superorganism and is perhaps the most sophisticated example known to date," he said.

Nieh was assisted in his experiments by UC San Diego undergraduate volunteers working in his laboratory. His study was supported by the UC San Diego Opportunities for Research in Behavioral Sciences Program, which is supported by the National Science Foundation. ORBS is a program for high school students and undergraduates that provides research experience for students who are traditionally underrepresented in the sciences.

Thursday, May 8, 2008

CNN -SAN FRANCISCO, California (AP) -- A survey of bee health released Tuesday revealed a grim picture, with 36.1 percent of the nation's commercially managed hives lost since last year.

art.bee.gi.jpg

Bees are dying at unsustainable levels, the president of the Apiary Inspectors of America says.

Last year's survey commissioned by the Apiary Inspectors of America found losses of about 32 percent.

As beekeepers travel with their hives this spring to pollinate crops around the country, it's clear the insects are buckling under the weight of new diseases, pesticide drift and old enemies like the parasitic varroa mite, said Dennis vanEngelsdorp, president of the group.

This is the second year the association has measured colony deaths across the country. This means there aren't enough numbers to show a trend, but clearly bees are dying at unsustainable levels and the situation is not improving, said vanEngelsdorp, also a bee expert with the Pennsylvania Department of Agriculture.

"For two years in a row, we've sustained a substantial loss," he said. "That's an astonishing number. Imagine if one out of every three cows, or one out of every three chickens, were dying. That would raise a lot of alarm."

The survey included 327 operators who account for 19 percent of the country's approximately 2.44 million commercially managed beehives. The data is being prepared for submission to a journal.

About 29 percent of the deaths were due to colony collapse disorder, a mysterious disease that causes adult bees to abandon their hives. Beekeepers who saw CCD in their hives were much more likely to have major losses than those who didn't.

"What's frightening about CCD is that it's not predictable or understood," vanEngelsdorp said.

On Tuesday, Pennsylvania Agriculture Secretary Dennis Wolff announced that the state would pour an additional $20,400 into research at Pennsylvania State University looking for the causes of CCD. This raises emergency funds dedicated to investigating the disease to $86,000.

The issue also has attracted federal grants and funding from companies that depend on honeybees, including ice-cream maker Haagen-Dazs.

Because the berries, fruits and nuts that give about 28 of Haagen-Dazs' varieties flavor depend on honeybees for pollination, the company is donating up to $250,000 to CCD and sustainable pollination research at Penn State and the University of California, Davis.

Saturday, March 1, 2008

Haagen Dazs worried about honey bees - CNN

Disappearing bees threaten ice cream sellers
Premium maker Haagen-Dazs says vanishing bee colonies in the United States could mean fewer flavors and higher prices.
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By Parija B. Kavilanz, CNNMoney.com senior writer
February 20 2008: 8:25 AM EST

bee_honey.ce.03.jpg
Bees are responsible for 40% of Haagen-Dazs' flavors currently sold in the market.

NEW YORK (CNNMoney.com) -- Haagen-Dazs is warning that a creature as small as a honeybee could become a big problem for the premium ice cream maker's business.

At issue are the disappearing bee colonies in the United States, a situation that continues to mystify scientists and frighten foodmakers.

That's because, according to Haagen-Dazs, one-third of the U.S. food supply - including a variety of fruits, vegetables and even nuts - depends on pollination from bees.

Haagen-Dazs, which is owned by General Mills, said bees are actually responsible for 40% of its 60 flavors - such as strawberry, toasted pecan and banana split.

"These are among consumers' favorite flavors," said Katty Pien, brand director with Haagen-Dazs.

"We use 100% all natural ingredients like strawberries, raspberries and almonds which we get from California. The bee problem could badly hurt supply from the Pacific Northwest," Pien said

Pien said Haagen-Dazs is hoping scientists get a breakthrough in this mystery soon. Otherwise, she said, the company may have to "re-examine the flavors that we currently offers our customers."

"We have to ensure that we have enough supply to maintain our variety," she said.

Additionally, a supply shortage of key ingredients could push up retail prices for its products, she said.

Pien said the company is donating $250,000 to both Pennsylvania State University and the University of California, Davis to fund research into the bee colony collapse disorder (CCD).

She said Haagen-Dazs is also rushing to raise consumer awareness about the problem by launching a new flavor this spring called Vanilla Honey Bee.

"We'll use part of the sales from this flavor help the honeybees," she said.

"This is the first time that Haagen-Dazs has adopted a cause like this," said Pien. "We are taking this very, very seriously because it impacts not just our brand but the entire food industry."