When labor is of minimal consideration, such as with homeowners and hobbyists, the knapsack sprayer can be effective. The time and energy needed to use a knapsack sprayer on fruit trees limits the device to small plantings. Although the solid stream setting will throw the liquid farther, it should not be used on fruit trees because there is little or no atomization. Others use an adjustable nozzle that can be varied from a wide discharge angle to a solid stream. Some designs allow for interchangeable nozzle tips so that the nozzle can be better matched to the job. The nozzle is often mounted at an angle on a 16- to -20-inch-long wand to aid spray placement on the trees. The distribution system includes an on-off valve, usually with a pistol-grip handle, and one or more nozzles on a wand. This eliminates hand pumping but increases the empty weight of the sprayer by about 50 percent. At least one company manufactures a knapsack sprayer with an engine-powered pump. The chamber that pressurizes the chemical liquid is very small, so the operator must pump while walking and spraying. Some backpack sprayers are equipped with pressure gauges as well as pressure regulators. The pumps are capable of relatively high pressures (80 to 180 psi). Some models can be adapted to either right- or left-hand pumping the other hand is needed to operate the flow-control valve and the wand. The sprayers have a built-in piston or diaphragm pump that is operated by hand. Before spraying, shake the entire sprayer to ensure a uniform mix. Some knapsack sprayers have a mechanical agitator that moves when the pump is used. Tanks on the knapsack sprayer typically are made of plastic or steel and hold three to five gallons. The parts of the knapsack sprayer are the same as those found on most sprayers: a tank to hold the spray mix a pump to produce pressure and flow a regulator to control the flow and at least one nozzle to atomize the spray mix (Figure 2.2). With 4 gallons of water, the weight is approximately 45 pounds. Also called a backpack sprayer, the knapsack sprayer is designed to be as light as practical.Ī typical empty weight is about 12 pounds.
COVER PLANTS SPRAYED WITH INSECTICIDES AND PESTICIDES MANUAL
This sprayer is entirely manual and is carried on an operator's back. Knapsack SprayersĪ knapsack sprayer is suitable for small plantings up to an acre in size. If you plan to apply herbicides underneath or around your fruit plants, you will need to have two sprayer-one for the application of herbicides and one for fungicides, insecticides, or foliar nutrients. Several choices of hand sprayers can provide adequate coverage on trees. Homeowners and hobbyists with small plantings need effective, low-cost spraying equipment.
Always follow the directions on the container package when mixing and applying pesticides.
Some mixtures are available in ready-to-use premeasured packets. These products allow you to buy one package of material instead of several individual pesticides that must then be mixed. This type of mixture will afford adequate control of insect and disease problems, provided the amount used, the method of application, and the time of application are correct. A GP-Product usually includes one or more insecticides and fungicides. Little or no toxic residues remain either on the fruit or in the environment if the pesticide is used according to label instructions.Ī number of general-purpose products (GP-Products) are available at retail outlets.
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