[Biological control efficiency of ladybirds on arthropod pests in cotton agroecosystems].
Based on the systematical investigation of population dynamics of predacious ladybird in different cotton agroecosystem, the energy flow for predacious ladybirds was analyzed by the way of ecological energetic. The biological control efficiency of ladybirds was compared in different planting-time and inter-crop cotton agroecosystems using available date on the prepapers of ladybird ingestion to pest production. The results showed that the ingestion of predacious ladybirds were 26.45-70 kJ.m-2 yr.-1, accounting for 28.30-47.88% of all predacious natural enemies in different cotton agroecosystems. The biological control efficiency of ladybirds to aphids were 5.07-12.85%, which was decreased in inter-crop cotton agroecosystems and the ecosystems with the delay of planting-time. It is suggested that the ladybirds play the important role of potential biological control in cotton agroecosystems.
Ge
Feng
F
Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100080. gef@panda.ioz.ac.cn
Liu
Xianghui
X
Pang
Weidong
W
Dang
Yanqin
Y
D000383:Agriculture; D000818:Animals; D001042:Aphids; D001181:Arthropods; D001517:Coleoptera / Q000254:growth & development*; D017753:Ecosystem; D003368:Gossypium; D010572:Pest Control, Biological / Q000379:methods; D011156:Population Density; D012621:Seasons