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Flower, Rose Shrub & Tree Pests
ArmywormsDescription: Cutworms and armyworms are the caterpillars of several species of night-flying moths. Cut-worms are plump, smooth and often, greasy-looking. Typically, cutworms curl up tightly when disturbed. They have greenish, brownish, grayish, or striped bodies, up to 1 3/4 inches long. Although about the same size, the armyworms differ in appearance. True armyworms are plump, sparsely-haired, generally green to brown larvae, with dark stripes running down the sides and back. These caterpillars feed on the aboveground plant parts of many grasses and is a pest of many garden and field crops. |
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CutwormsMany species. Cutworms are dull gray, brown, or black, and may be striped or spotted. They are stout, soft-bodied and smooth, and up to 1 and 1/4 inches long. They curl up tightly when disturbed. |
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Flea BeetlesMany varieties of sweet corn, especially early maturing, yellow kerneled varieties, are susceptible to a bacterial disease called Stewart's wilt. The disease causes reduced yields, and an entire planting can be stunted or killed (see HYG fact sheet 3095-83, Stewart's Bacterial Wilt & Leaf Blight of Corn, for more information on this disease). This disease was discovered in 1895 but it was not until 1923 that an insect was determined to be the vector of the disease. The disease is transmitted primarily by the corn flea beetle. |
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GrasshoppersAn important component of grasshopper life history is the seasonal cycle - the timing of the periods of egg hatch, nymphal growth and development, emergence of the adults and acquisition of functional wings (fledging), and the deposition of eggs or reproduction. The occurrence of these periods varies among the species and is greatly influenced by weather. An early spring hastens these events and a late one delays them. Latitude also influences the dates of occurrence. In North |
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