Investigation on diseases and pest insects of lucerne in Huanghua city, Hebei and their control.
A systematic survey on the diseases and pest insects in lucerne fields was carried out in 2002-03 in Huanghua city, Hebei, China. Six diseases and 8 pest insects were recorded. The 6 diseases were Pseudopeziza medicaginis, alfalfa mosaic virus, Peronospora aestivalis, Colletotrichum trifolii, Erisyphe polygoni and Uromyces striatus. The 8 pest insects were Aphis craccivora, Locusta migratoria, Frankliniella formosae, Heliothis dipsacea, Holotrichia oblita, Adelphocoris lineolatus, Ascotis selenaria and Loxostege sticticalis. Measures for its control included use of resistant varieties, protection of natural enemies, application of scientific cultural techniques and chemicals, such as parathion.