- Leave the trap in the soil for 2 4 doys .Closa t the trapping the followirng 3
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- Leave the trap in the soil for 2 4 doys .Closa t the trapping the followirng 3 woeks and count i caught practica PRACTICAL 3: SPRAYING FOR INSECT PETS The aim of this exercise is to introduce caiculations when applying ma A farmer growing cabbages has been advised to use Decis 25e instructions 25g/) to control diamond back moth larvae on his cabbage cropng are that the farmer must spray 3 times.at 14.day intervals during the season, beginning when the economic threshold is reached. application rate is 100 ml of Decis 25 EC per 100 1 per ha to achiev spray deltamethrn ecommended Assume the farmer is growing 5 ha of cabbages. Using this information, answe the following questions: 1. Whattype of formulation is this insecticide? Em.sdnou on 2. How is it formulated? 3. In which group of conventional insecticides is this insecticide? 4. What is the mode of action of this insecticide? 5. What does full cover spray mean? 6. How many grams of technical grade deltamethrin are there per lt litre of formulation? 2sgrarn 7. What percentage active ingredient is in the formulation? 8. What percentage of the fomulation are the inert ingredients? 9. How much active ingredient is used per ha per application?e stan 10. How much active ingredient is used per season?Explanation / Answer
1) Emuslfiable Concentrates.
2) EC is the combination of active ingredient which is dissolved in a water-immicible solvent with emulsifiers.EC formulations are diluted with water in the spray tank so that they can from a spontaneous emulsion which can be achieved by choosing one or more surfactant based on their ability to emulsify the solvent system including active ingredient into water. Balancing the water soluble and oil soluble surfactant at the water solvent interface which results in the formation of physically stable emulsion.
4) Conventional insecticides are synthetic chemicals, work by directly killing or inactive pests. They are absorbed directly through an insect's exoskeleton. These compounds are known as contact poisons because they are effective on contact.Some insecticides are released in gaseous state which enters the insect body through its tracheal system.
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