Rehs Vectors Exam With 100% Correct And Verified Answers, Exams of Advanced Education

Download Rehs Vectors Exam With 100% Correct And Verified Answers and more Exams Advanced Education in PDF only on Docsity! Rehs Vectors Exam With 100% Correct And Verified Answers Which sex of the mosquito bites? - Correct Answer--Females. 2.Why does a female mosquito have to take a blood meal? - Correct Answer--Needed in order to mature her eggs. 3.Why are mosquitos known as a vector? - Correct Answer--Because they release infectious agents when taking a blood meal. Inoculation. 4.Describe the diseases which a mosquito can spread. - Correct Answer--Four common diseases of the mosquito are Plasmodium Vivax (Malaria), Yellow Fever, Encephalitis, Filariasis. 5.Describe the lifecycle of a mosquito. - Correct Answer--11 to 16 day cycle. Adult female mosquitoes lays eggs in water, eggs hatch in 2-3 days into larvae, larvae feeds on organic matter, larvae turn into pupa (4-10 days later). Pupae then turns into an adult mosquito in 2 days. 6.What are some larval characteristics of mosquitos? - Correct Answer--Depending on type of species. Anopheles larvae (malaria vector) are flat looking and wiggle horizontally up and down. -culex larvae (western st. louis encephalitis) has a long breathing tube. Tube can be seen out of the water. -The Aedes larvae (yellow fever) has a short breathing tube. It moves at different angles. 7.Describe how mosquito surveys are performed. - Correct Answer--check for flow characteristics, stagnancy, and pollution levels in open bodies of water. Mosquito dippers used to capture larvae and study the adult mosquito. 8.what are Tossits and how are they used? - Correct Answer--A petroleum based oil pesticide used to **** up larvae. Considered a hazardous material in California! Liquid detergent is now used. 9.Name 2 common natural enemies of the mosquito. - Correct Answer--Gambusia Affinis: Minnow freshwater fish is referred to as the mosquito fish. -The DragonFly: kills larvae and adult mosquitoes. 10.Describe some mosquito control methods. - Correct Answer--Pesticides (used as a last resort). -When larvae control has failed these methods can be used: -Fogging (spray insecticides) misting technique into the air. -Screening, protective clothing; physical barriers. -Repellents: diethyltoluamide (deet) very popular active ingredient. Vit. B12 or garlic or garlic oil. 1.Why is the fly considered the world's filthiest insect? - Correct Answer--Due to its tendency to get into garbage, feces, and food. 2. Describe how the fly eats. - Correct Answer--flies would regurgitate on the flood, which digests the food and then the fly reabsorbs the juices. 3. What are the 4 stages of development for the fly? - Correct Answer--The egg, the larvae, the pupa, complete metamorphosis. 4. What diseases are commonly associated with flies? - Correct Answer--Typhoid fever, hepatitis, tapeworm, shigella, e.coli, salmonella, hookworm, paratyphoid fever, cysts (amoebiasis), and Onchocerciasis. 5. To what scientific family does the fly belong to? - Correct Answer--Diptera family, known for a single pair of wings. 6.The maggot stage is also known as what stage of development? - Correct Answer-- The larvae stage. 7. How do biting and not-biting flies differ? - Correct Answer--The biting variety which include the horse fly, deer fly, stable or flesh fly, black fly and the sand fly. -The non- biting variety is also known as the domestic or synanthropic flies. Example house fly. 8. Where do most pupa go to develop? - Correct Answer--Warm, moist organic material is the perfect breeding media; Manure! 11. Where are face flies usually found? - Correct Answer--cooler climates such as attics or other cool places. 12. What does the biting stable fly have that the domestic house fly does not? - Correct Answer--Possesses a proboscis. Has mouth parts which bite and usually bite very hard. 13. What fly was used during the civil war to clean out a war wound? - Correct Answer-- The flesh flies! 14. Why are blow flies attracted to mercaptan or garbage? - Correct Answer--They're attracted to the mercaptan or garbage because of the release of sulfuric compounds that simulate the odor of decomposing flesh. 15. What are the primary differences between the blackflies and deer flies? - Correct Answer--Black flies can lay eggs in free flowing water. They transmit onchocerciasis (river blindness), and the bite is usually painless. -Deer flies spread tularemia, bites are vicious biters, and found on the Atlantic coast. 16. What are some of the characteristics in fly control? - Correct Answer--SANITATION! 3. Describe some rodent induced diseases. - Correct Answer--Some rodent induced diseases include: Rat Bite Fever, Leptospirosis, Salmonellosis, Murine Typhus, Plague, etc. 4.What rat is common implicated for rodent bites to humans? - Correct Answer--The Norway rat is commonly implicated for rodent bites in humans. Common victim is children. Can produce rat bite fever (Spirillum and Strepto bacillus bacteria). 5. Describe some of the physical characteristics which rodents are sensitive to. - Correct Answer--Rodents have keen sense of touch from their whiskers, and prefer to have constant contact with walls and floors. Poor eye sight, adapted for low light vision. Seek out food smells. Can eat almost anything. Great sense of hearing. Great balance, jumping, good swimmers and good learning. 6.What are some techniques used to discover rodent infestations? - Correct Answer-- There are direct and indirect observations for discovering rodent infestations. Indirect is most likely what an inspector would rely on. Look for droppings, use tracking dust to catch rodent tracks, or look for rub marks (greasy) on walls. Also, look for gnawing, burrows, UV lights (not too reliable). 7.Why do rodents have to gnaw? - Correct Answer--Rodents have to gnaw, in order to survive. Their teeth will continue to grow and disable them if they do not gnaw. 8. The leptospirosis organism can be found in what part of the infected rodent? - Correct Answer--Leptospirosis can be found in the urine of the rodent. Can be detected by UV light but not too reliable. 9. Describe some control methods for rodents? - Correct Answer--Some control methods would be: eliminate food source, proper sanitation (remove lumber piles, large accumulation of ivy, trip your trees). Plug holes and entrances such as foundation vent screens, crawl spaces. 10.What is the purpose behind the L concrete barrier? - Correct Answer--The purpose of the L concrete barrier is to physically stop Norway rats from burrowing underneath your home. Typically a four inch thick underground concrete barrier. 11.Describe the rodent proofing techniques for the domestic home. - Correct Answer-- Some rodent proofing techniques are screening ventilation and foundation vents. Trim trees and bushes, nothing should overhang or touch home. Pipes coming out of home should not have an opening greater than a ¼ inch. Check any doorways. Eliminate any piles of debris. Clean any fruits, vegetables, nut trees, that may have fallen on the ground. 12.Interior Control is an important aspect in rodent control. Describe some methods. - Correct Answer--Check for sanitary conditions. Food being left out, improper storage containers, dirty dishes. Check for cabinets directly below the sink, look for access holes larger than a quarter of an inch can provide rodent access. Check heater units and ducts. 13. What is the purpose behind the ectoparasite control? Why is it first priority? - Correct Answer--The purpose of ectoparasite control is to eliminate the parasites found on the fur of large rodent infestations. This supersedes immediate extermination, because rodents are an excellent vector ground for fleas and other parasites. 14. Refuse collection and storage is an important aspect of rodent control. Why? - Correct Answer--Wet garbage and highly putrescible waste left unattended and unconstrained can be a breeding ground for rodents and other insects. 1.Describe the theory or the aspects behind the perfect pesticide. - Correct Answer-- The perfect pesticide is one that hits and kills the target organism, harmless to humans and beneficial insects and is relatively non-toxic. In the real world this does not exist. 2.There are 4 classifications for pesticides, describe them. - Correct Answer--Stomach poisons:must be ingested; bait.-Contact: absorption by touching; dust.- Fumigant:Breathes; hydrogen cyanide. -Desiccants:releases body fluids of the insect and dries out the insect; silica gel. 3. What is a synergist and what example does the manual use? - Correct Answer-- refers to the combination of two substances that yields a greater overall effect compared to separate uses. Example: Roach Router Spray. 4.What is pyrethrum? - Correct Answer--Botanical, has an LD50 of 1500 mg/kg. Natural organic insecticide; irritates insects and makes them escape applied areas. 5.Describe the magnification theory of the food chain? - Correct Answer--The idea that insecticide can move up the food chain as prey fall to predators, eventually the insecticide will effectively infect all animals as it works its way up the food chain. 6. Define what a repellant does. What are some natural types? - Correct Answer-- DEET, applied to skin or clothing can be an effective insect repellent for many varieties of insects. 7. Anticoagulants bait used for rats kills by what process? - Correct Answer--stomach poison, taken internally and consecutively (multiple doses) induces an internal bleeding effect. 8. Describe some real poisons in rodent control. - Correct Answer--Red Squill: Natural emetics (causes throwing up). -1080: resembles white sugar or flour. Very poisonous and fast acting. 1081: similar to 1080, but doesn't biodegrade, can be equally toxic to humans. -ANTU: (Alpha-Naptha-ThioUrea) very effective against Norway rats. Produces fluid inside rodents lungs. Nor-Bromide:safest of the poisons, highly toxic to Norway rats. Strychnine: exclusive for mouse control, causes violent muscle spasms and death from paralysis. 9.What is a bait box? Where is it used? - Correct Answer--A box that contains a bait dosed with anticoagulant. Replace bait for 5 to 7 days. Bait boxes should be placed inside cabinets or in the line of the rodent's path. 10.Why is the termicide chlordane no longer used for termite treatments? - Correct Answer--Studies have shown that it can vaporize and collect in dwellings causing chemical poisoning symptoms to the occupants of the home. 11. What pesticides are commonly used for head lice? - Correct Answer--Lindane. 12. What pesticides are commonly used at dairies? - Correct Answer--Methoxychlor: very effective against fleas,flies and moths. Poison isn't absorbed by the fatty tissues of cattle. 13. Describe some of the advantages and disadvantages of D.D.T. - Correct Answer-- Very effective, however it has a half life of 10 years. Kills many animals and almost wiped out the California Condor. 14. What does LD50 stand for? - Correct Answer--Lethal Dose. 15.What are single dose poisons. Give a few examples and their characteristics. - Correct Answer--Very toxic and dangerous, should be used by licensed pest control professionals. Look at question 8. 16. What are some of the advantages of the rodenticide called VACOR? - Correct Answer--A new agent effective against rodents that are resistant to anticoagulants. Biggest advantage is that in certain non-target animals, it is low in toxicity. High toxicity for humans till.