Calculate the TRV gallonage for the planting. Multiply this rate by 0.75 to obtain a concentrate TRV rate. The following table will help make the conversion from rate per 100 gallons to rate per gallon. Care should be taken to measure pesticide amounts accurately because errors will be magnified at small volumes. 100 gallons 5 gallons 3 gallons 1 gallon Wettable Powder 5 pounds.
Several pesticides break down rapidly in alkaline water.
Captan, Cygon, Imidan, Kelthane, malathion, and Omite are examples of compounds that are especially vulnerable to alkaline hydrolysis. Buffercide, Buffer-X, Unifilm B, and LI 700 Acidiphactant are examples of such buffering agents. Granulated food grade citric acid may be the most convenient and inexpensive acidifying material. Do not try to acidify solutions containing Bordeaux mixture, fixed copper, or other copper compounds. This guide lists recommended materials for the common disease and insect pests of grapes and small fruit.