Population density of aphids at the time of settling and ovariole maturation inCoccinella septempunctata [Col.: Coccinellidae] |
| |
Authors: | A. Honěk |
| |
Affiliation: | (1) Research Institute for Plant Production, Ruzyně 507, 161 06 Praha 6, Czechoslovakia |
| |
Abstract: | In 1978 and 1979 in Central Bohemia the census of aphid populations on bean, sugar beet, cereals, maize, and alfalfa were taken at the time when overwinteredCoccinella septempunctata L. (1) settled and (2) the ovarioles of females ripened. Settling occurred immediately after aphid immigration. Minimum aphid density required for settling was estimated to about 10 aphids per 1 m2 of field area. The aphid density at the time of ovariole ripening equaled 1 aphid per 200–400 cm2 of leaf area. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|