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Identify situations in which compressed-air sprayers are used.
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Describe how you attain compres air in a compresed air sprayer
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7A Chapter 6
| Question | Answer |
|---|---|
| Identify situations in which compressed-air sprayers are used. | The hand-held, compressed-air sprayer is used to make residual and, sometimes, contact insecticide applications. It can also be used to apply herbicides around a structure's foundation. |
| Describe how you attain compres air in a compresed air sprayer | When you push the pump plunger down, it forces air through a check valve and compresses it inside the tank and prevents air from escaping while you pull the plunger back up. |
| Explain how a compresed air sprayer spray is released. | When you squeeze the trigger on the wand, it opens a discharge valve which allows the compressed air to force the spray mix into the hose and wand and out through the nozzle. |
| Explain why it is important to attain the proper pressure when using a compressed-air sprayer. | The more times you push the plunger, the greater the pressure builds inside the tank. The right pressure will help you avoid other problems. |
| How does excessive pressure affect the type of spray pattern produced in a compressed-air sprayer? | Excessive pressure will produce fine spray droplets that may drift outside the target area. Excessive pressure can also cause splashing and splattering onto other surfaces that may be stained by the spray mix. |
| How does low pressure affect the type of spray pattern produced in a compressed-air sprayer? | Too low a pressure can cause coarse spray droplets that may stain treated surfaces. Insect control may also suffer if the drops are so coarse as to fail to provide complete coverage of the treated surface. |
| Give examples that show why it is important to consider the formulation and treated surface when using a compressed-air sprayer. | Do not apply water-based sprays directly to electrical outlets. Do not use oil-based sprays near open flames or floor tile. Do not treat freshly painted surfaces. Avoid wetting a surface to runoff; wipe up any excess product. |
| Explain why and how you should relieve the internal pressure before opening a compressed-air sprayer. | release the pressure first. so the pressure doesn’t force the spray mix into your face or eyes when you remove the plunger. Most have a pressure relief valve in the neck of the plunger, turn it counterclockwise until you the sound stops. |
| Tell when it may be more practical to use a backpack sprayer than a compressed-air sprayer. | The backpack sprayer is an alternative to the compressed-air sprayer for applying pesticides outdoors either to exterior building surfaces or to surfaces adjacent to the structure. |
| Indicate what types of situations dusts are suitable for. | Dusts are used to control crawling insects such as cockroaches, ants, and silverfish that hide in voids, cracks, and crevices and bees and wasps in cavities. |
| Explain why you only want to produce a fine layer when you apply dusts. | Applying it so that a thin layer is created is the most important element in dust application. Insects are repelled by thick layers of dust. |
| List precautions you must take when applying dusts. | eye and respiratory protections, combustibility, close windows and doors and shut off fans, don’t apply where they can filter into food or living areas. |
| Tell when hand and power dusters are usually used. | Hand dusters are the most frequently used type of duster. Power dusters are designed for dusting large areas such as attics, crawl spaces, or pipe chases. |
| Describe how power dusters operate. | Some power dusters function like fire extinguishers. They use compressed air in a tank to force the dust out of the spout. Electric-powered dusters use a high-volume, battery-powered blower to pick the dust up and carry it into the void. |
| Explain how to operate a bulb or bellows duster -including the proper positioning of the delivery tube when you operate bulb or bellow dusters. | A hand shaker consists of a container that has a screened or perforated lid. Bulb and bellow dusters are operated with one hand and are squeezed to apply the dust with the tube on top when you squeeze. |
| Explain how to operate a plunger duster and foot duster? | Plunger dusters take two hands to operate. The foot pump is similar to the plunger duster except that you hold the duster down with your foot and pump with your hands. |
| What size droplet is produced by canned aerosols? | Canned aerosols produce fine droplets of pesticide that are between 20 and 30 microns in size – |
| List the types of applications that can be made using pressurized cans, including canned aerosols and pressurized liquids. | When a small tube is attached, cockroaches can be flushed from cracks, crevices, and wall voids and used to control flying insects in large enclosed spaces. |
| Pressurized liquid sprays produce a coarse spray how is this useful? | Pressurized liquid can then be applied as a thin film of pesticide on a surface. |
| Explain how pressurized cans deliver pesticide. | Pressurized canned pesticides contain a pesticide formulation and a gas propellant. The gas pushes the pesticide through the nozzle when the valve is opened. The gas rapidly evaporates, leaving the pesticide floating in the air, or on the target surface. |
| Is the convenient and ready to use pesticide in a pressurized can an Advantage or Disadvantage? | Advantage |
| Pressurized can pesticides eliminates the risks associated with handling and mixing pesticide concentrate is this an advantage or disadvantage? | Advantages |
| Pressurized can pesticides eliminates the need for special equipment to buy and maintain is this an advantage or disadvantage? | Advantage |
| Pressurized canned pesticides often use less pesticide then other applications is this an advantage or disadvantage? | Advantage |
| Pressurized gas helps deliver pesticide deep into cracks, crevices, and voids applications is this an advantage or disadvantage? | Advantage |
| Pressurized canned pesticides often are more expensive than pesticide concentrates for the area treated; you pay for the convenience is this an advantage or disadvantage? | Disadvantage |
| Pressurized canned pesticides can be easy to over apply the pesticide, which adds to the cost of use is this an advantage or disadvantage? | Disadvantage |
| Pressurized canned pesticides contain propellants may be flammable, so check the label for warnings. Also, cans may lose pressure during use and thus deliver the pesticide less effectively is this an advantage or disadvantage? | Disadvantage |
| Pressurized canned pesticides must be store at moderate temperatures (between 70° F and 120° F). High temperatures can cause explosions and low temperatures can reduce pressure and result in improper droplet size is this an advantage or disadvantage? | Disadvantage |
| Explain why ULD applications can be made only if specifically allowed by the pesticide label. | Since ULD involves the use of higher than normal concentrations and lower than normal rates of application, you may make such an application only if the label specifically allows it. |
| Compare spray particles from ULD applicators and from conventional equipment with respect to size and ability to control structural insect pests. | Research indicates droplets in the 5 to 15 micron range produced by ULD equipment, are more efficient for controlling cockroaches and other structural pests than the droplets in the range of 100 to 400 microns produced by conventional sprayers. |
| Discuss the penetration of ULD spray droplets into areas that are not in the direct line of application. | ULD spray droplets may not penetrate areas that are not in direct line with the spray outlet. Penetration is primarily dependent on droplet size, speed, velocity of the droplets, air currents where droplets are introduced, and gravity. |
| Explain why continuing to run a cold fogger until you actually see fog may be undesirable. | It would mean that the ventilation wasn’t sufficient. Not sure about this one… |
| Describe steps you should take when preparing to make an application with a cold fogger or thermal fogger after closing and lock all entrances to the treatment area? | Post entrances with warning signs if required by label or you feel doing so reduce exposure risks. After the treatment thoroughly ventilate the area according to label directions before you allow unprotected individuals to reenter the area. |
| Describe the differences between thermal foggers and cold foggers. | Thermal foggers differ from cold fog generators in that they use heat to vaporize insecticides. Compared to cold foggers, thermal foggers require a longer treatment time and present more of a fire and explosion hazard. |
| What pressures are possible with a backpack sprayer? | 25 psi for injection; Pressures of 45 to 75 psi are possible. |
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