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Schools Integrated Pest Management (Ipm) for Wasps and Bees

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Schools Integrated Pest Management (Ipm) for Wasps and Bees SCHOOLS INTEGRATED PEST MANAGEMENT (IPM) FOR WASPS AND BEES *Important Note* According to the Virginia Pesticide Control Act (Section 3.1-249.53), in order to apply ANY pesticide (including Raid, Round-Up, and other over-the-counter pesticides) in public areas of ANY educational institution, the applicator must first be certified by the Virginia Department of Agriculture and Consumer Services. In other words, it is illegal for uncertified teachers, staff, administrators, or contractors to apply pesticides on school grounds. INTRODUCTION Bees and wasps experience “complete metamorphosis”. This means that they pass Wasps and bees are both beneficial and through four different life stages: egg, larva, problematic. Wasps, being predators, play pupa, and adult (see Figure 1). Individuals an important role in the control of other pest that are newly hatched are termed “larvae”. insects. Bees are essential pollinators of Larvae are blind and legless. After the plants and producers of products such as larval stage, they become pupae. The pupal honey and wax. Both vigorously defend stage is a non-feeding, immobile stage their nests and utilize stinging as their wherein the larvae transform into adults. primary defense mechanism. Although the Finally, the bees and wasps emerge from the sting of a bee or wasp is painful, it is usually pupae as fully developed adults. not life threatening. However, some individuals are extremely sensitive to the sting’s venom and may experience fatal allergic reactions. BIOLOGY AND IDENTIFICATION Bees and wasps are grouped together into the same order of insects, Hymenoptera. For the purposes of this publication the term “wasps” refers to hornets, yellowjackets, paper wasps, mud daubers, digger wasps, cicada killers, and any other wasp species that frequently are a problem around structures. The term “bees” refers to honey bees, bumble bees, and carpenter bees. All bee species and most wasp species are winged. Bees can be distinguished from Figure 1. The Life Cycle of a Bee or Wasp wasps by their stout, hairy bodies. Wasps, on the other hand, have relatively smooth, slender bodies. Another important Wasps and bees display various levels of difference between bees and wasps is their social behavior ranging from non-social, stinger. Bees have barbed stingers. solitary mud-daubers to highly social honey Therefore, bees can only sting once, leaving bees. The social species of wasps and bees the stinger within the victim. Wasp stingers live together in highly organized lack the barb so wasps can sting multiple communities where they share food times in defense of their nest. resources and cooperate in raising the young. Most pestiferous wasps live in these types of large, organized colonies. Ground- nesting wasps, such as yellowjackets, often or bush containing an aerial nest, or even build subterranean paper nests. Other walks past a previously agitated nest. species of wasps build aerial paper nests in trees, under eaves, or within wall voids (see If bees or wasps or their nests have become Figure 2). These nests can contain a nuisance, remember that control can be a thousands of individuals, all with the ability hazardous undertaking and should only be to sting. Some solitary species, such as done after considering all safety precautions. mud-daubers, construct galleries of mud If nests are large, it may be advisable to wherein they stash paralyzed spiders and have professional pest control operators other prey. Upon laying an egg within the handle the situation. gallery, the female seals it shut, thus leaving a plentiful food supply for the next PREVENTION generation. Solitary wasps will sting if provoked. Bees or wasps often can be kept from becoming a nuisance by limiting their access to nesting sites and food and water supplies. The best way to accomplish this goal is through sanitation and maintenance. This may require time and effort but can be a permanent fix to the problem if done correctly. Below are some of the most effective methods of prevention using sanitation and maintenance: 1. Keep all outside trash receptacles tightly covered. 2. Remove trash from within all receptacles frequently. This will assure that trash will not prevent the lid from Figure 2. Hornet Nest in a Tree closing securely over the receptacle. Bees and wasps become increasingly 3. Clean dumpsters frequently. abundant and active from spring through fall 4. Remove any dependable water source as the temperature rises and food sources near the structure. Repair leaky become more available. Bees feed on outdoor faucets. Direct air conditioner nectar and pollen from flowering plants. drainage to areas where water will not Wasps feed primarily on protein sources, pool. If you have depressed areas such as spiders and insects, but will also where water pools after a rain, level the readily feed on sugar sources. Wasps, areas to prevent future pooling. because of their food preferences often 5. Caulk any holes and cracks in the scavenge around humans. Human activities building that can be used by bees or provide a ready supply of protein and sugar. wasps to gain access into the structure. Bees and wasps may use these as Bees and wasps will usually avoid humans if entryways to establish nesting sites possible. Foraging individuals will within the structure. normally refrain from stinging unless threatened. Yet, if the colony is threatened MONITORING AND INSPECTION these insects will vigorously defend their nest. Disturbing a colony can occur when Detection and monitoring are important in someone accidentally steps on or mows over controlling bee and wasp problems. Killing an underground nest opening, agitates a tree individual bees or wasps will not solve the problem; entire nests must be destroyed or 2 removed. In order to treat a nest, one must control operator to physically remove the first find it. pests. Listed below are several effective recommendations for removing bees and Nests can be found underground, under wasps: eaves, in wall voids, and in trees. Inspect bushes, logs, rock piles, and other protected 1. Trapping for wasps (particularly sites for the presence of nests. In order to yellowjackets) can be an effective tool determine the continued success of your for reducing foraging wasps in an area. management plan and to locate new nests, Several traps on the market utilize bait continue monitoring on a regular basis to attract wasps. Other traps, such as throughout your integrated pest management sticky traps, use colors (especially (IPM) program. yellow) to attract the wasps. Trapped wasps die when placed in a freezer for a Regularly inspect the premises during the few hours. spring and early summer. Inspecting during 2. Nest removal is also possible if the the spring and early summer will allow you proper precautions are taken. If the nest to detect incipient nests. Incipient nests are is in an accessible area (like hanging easier to remove than mature nests. from a tree branch) a strong plastic bag can be used to enclose the nest. The LEAST TOXIC CONTROL base of the nest or branch can then be METHODS severed and the nest removed. 3. Vacuuming out entire nests is another The purpose of integrated pest management option. We recommend that only a is to reduce two things: the pest population professional do this. Vacuuming can be and the amount of pesticides needed to particularly useful when bees or wasps accomplish that goal. With the exception of are found within a wall void or found in emergency situations, all other available an environmentally sensitive area where control methods should be used prior to pesticides can not be used. If a vacuum using a pesticide. Below are some of the is used, it is well to remember that once most effective and least toxic methods the vacuum is turned off, the wasps will available for ant control. be able to find their way out of the vacuum. Therefore, it is important that One suggestion that is applicable in most the vacuum bag is quickly sealed and bee and wasp situations is to perform the removed from the vacuum cleaner. control measures at night. Nighttime Wasps die upon placement of the bag removal reduces the risk of being stung within a freezer for a few hours. since the insects are slower and may have a more difficult time finding the source of the Chemical Management disturbance. In addition, at night wasps and bees are not foraging but are in their nests. Sometimes sanitation, maintenance, and Finally, at night children are not present on physical removal alone may not be enough school grounds, reducing the risk that a to control an existing bee or wasp problem. stinging event will occur. If bees and wasps persist or if an emergency situation warrants immediate control of a Physical Removal problem, chemical pesticides may be needed. Remember that Virginia law Due to their stinging nature, the physical requires that all pesticides applied on school removal of bees and wasps is difficult. Yet, grounds must be applied by a certified if careful action is taken physical removal is applicator. All pesticides should be applied possible. It is advisable to wear protective according to labeled directions. Applicators clothing or to simply ask a professional pest must wear protective clothing. Pesticides 3 should never be applied where they might RECORD KEEPING runoff into storm drains or sanitary sewers. Protect yourself against liability. Record all Whatever the control method you choose, it chemicals applied in a pesticide application is imperative that you keep clear, accurate IPM logbook on the facility’s premises. records of all actions taken. Some Include the name of the applicator, the date pesticides are more environmentally friendly of the application, the formulation, and the than others. Below are listed different brand name of the chemical used.
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