Insect Control on Florida Bunch Grapes (W. C. Adlerz) Nany insects can be found on Florida bunch grapes. Some can be severely damaging if they occur in large numbers and control may be necessary. To keep spraying to a minimum, growers may wish to become acquainted with insects having the greatest damage potential, inspect vines frequently, and spray only when necessary. Partial List of Florida Grape Insects Class la Class 2a Grape flea beetle Grapevine aphid Grape leaf skeletonizer Sharpshooters Seed chalcid Scale insects Grape leafhopper Grape leaf folder (Class 1-2) Crape root borer Achemon sphinx large caterpillars Grasshoppers Scarab beetles (Anomala, class 1-2) Gall insects Curculio Twig borers Fruit beetles, bees, and wasps a Class 1 insects have a greater damage potential than Class 2 insects. Grape Flea Beetle Damage by grape flea beetles results mostly from adult feeding on newly emerging buds in the spring, and adult and larval feeding in the flowers. Spray when necessary. Grape Leafhopper Grape leafhoppers breed on grape plants. Adult and young leaf- hoppers feed on the undersides of leaves, removing chlorophyll and leaving pale feeding spots. Feeding spots may be so numerous as to cause yellowed leaves and leaf drop. Excreta from these insects may collect on the fruit which will then be spotted and possibly covered with sooty mold. An application of insecticide made prior to flowering and a second application two weeks later will kill many overwintering adults and reduce the spraying needed later in the year when the plants are larger. To keep plants as vigorous as possible, grape leafhoppers should be controlled. Seed Chalcids Seed chalcids will affect the following bunch grapes that are adapted to Florida growing conditions: Blue Lake, Lake Emerald, Stover, and Norris. It appears that Blue Lake is the most susceptible variety. No information is available on susceptibility of SV 12309. Where experience shows that seed chalcids are abundant, an annual preventive spray program will be necessary.