MS and MCS of farmer mixing pesticide spray, of tractor-drawn machine dusting potato field. Shot of horse-drawn power duster dusting cabbage field, man dusting turnip field with wheel-barrow type duster, man spraying potato field with knapsack type duster, of cabbage field and squash field being sprayed with knapsack type duster. Shot of man dusting cabbage with rotary type machine, spraying potatoes in field with portable compressed air duster. Shot of man dusting cabbage field with old style method using burlap bag duster. Shot of man hand spraying potato field for Colorado beetle, placing tar paper discs around young cabbage plants for protection against blight. Shot of green tomato worm on leaf. Shot of cabbage worm on edge of leaf. Shot of green-coloured cabbage worms on leaf. Cut to worm in man's hand. Shot of carrot maggot sticking out of carrot. Shot of striped cucumber beetle on leaves. CU of Colorado beetles eating potato leaves. Shot of lady bug beetle (predator) on leaf. Shot of two predator beetles on leaf attacking larvae of other insect. Shot of squash bugs on leaf sucking sap from leaf with long black beak. CSs of squash eggs on leaf. Shots of various types of aphids on leaves of plants. Shot of praying mantis on leaf cleaning it's face and eating grasshopper. CSs of carrot damaged by carrot maggot, cabbage damaged by aphids, onion patch showing damage caused by onion maggot, cabbages damaged by cabbage maggot, bean plants damaged by bean maggot, squash plant damaged by squash bug, asparagus plant damaged by beetle, parsnip showing webworm damage, damaged tomatoes in crate caused by slugworm. CU of potatoes, carrots and squash damaged to some degree by insects.