. Cooperative economic insect report. Insect pests Control United States Periodicals. - 45 - Hosts: Known to feed on many plants, but completes development only on Chenopodiaceae. Cultivated hosts include beets, spinach, mangold and garden sorrel. Life History and Habits: The overwintering adults emerge from April 15 to May 22 in Poland and migrate to beet fields. When no plants have sprouted, they feed on wild Chenopodiaceae such as goosefoot. The eggs are deposited on underside of the seed leaves or on the stem of the plant; hatching in 2 to 3 weeks. The nymphs pass through 5 molts, total de
. Cooperative economic insect report. Insect pests Control United States Periodicals. - 45 - Hosts: Known to feed on many plants, but completes development only on Chenopodiaceae. Cultivated hosts include beets, spinach, mangold and garden sorrel. Life History and Habits: The overwintering adults emerge from April 15 to May 22 in Poland and migrate to beet fields. When no plants have sprouted, they feed on wild Chenopodiaceae such as goosefoot. The eggs are deposited on underside of the seed leaves or on the stem of the plant; hatching in 2 to 3 weeks. The nymphs pass through 5 molts, total development lasting from 33 to 86 days. Overwintering" females deposit eggs until the end of August. Summer-generation adults usually appear the second-half of June and start to enter hibernation around July 1. They overwinter in edges of fields, grass borders and beneath trees and bushes. Gener- ally, there is only one generation a year. The primary symptoms of leaf crinkle disease on beets develop shortly after feeding and consist of light-colored spots. Secondary symptoms develop after a latent period. Leaves become bent and crinkled and turn inwards, often resembling loose lettuce. The veins are prominently white and the leaf is brittle. The entire growth of the plant is retarded or arrested and the sugar content diminished. Description: The eggs are minute and oblong, averaging mm. by mm. in size, and honey-yellow in color. Newly hatched nymphs are at first orange-yellow but turn green when mature. Adults are between 3 and mm. long and from 1 to mm. wide; gray in color with markings on the elytra. (Prepared in Plant Pest Survey Section in cooperation with other ARS agencies.) CEIR 7 (47) 11-22-57. Adult and Fifth-instar Nymph of Piesma quadratum Figures (except map) from Wille, J. 1929. Die Rubenblattwanze. Monog. zum Pflanzenschutz 116 pp., Please note that these images are extracted from scanned page images that may have been digitally enhan
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