[Ecological effects of wheat-oilseed rape intercropping combined with methyl salicylate release on Sitobion avenae and its main natural enemies].
In order to explore the effects of wheat-oilseed rape intercropping in combining with methyl salicylate (MeSA) release on Sitobion avenae and its main natural enemies, a field experiment was conducted at the Tai'an Experimental Station of Shandong Agricultural University in East China from October 2008 to June 2010 to study the temporal dynamics of S. avenae and its main natural enemies as well as the ecological control effect on the aphid. In the plots of intercropping combined with MeSA release, the S. avenae apterae population reached a peak about 12 d in advance of the control, but the peak value was significantly lower than that of the control. The average annual number of S. avenae apterae per 100 wheat tillers decreased in the order of wheat monoculture > wheat-oilseed rape intercropping > MeSA release > wheat-oilseed rape intercropping combined with MeSA release. Moreover, the total number of ladybeetles was the highest in the plots of intercropping combined with MeSA release. The population densities of aphid parasitoids reached a peak about 10 d in advance of the control, which could play a significant role in controlling S. avenae at the filling stage of wheat. Taking the biological control index (BCI) as a quantitative indicator, and with the ladybeetles and parasitoids as the dominant control factors in fields, it was observed that wheat-oilseed rape intercropping combined with MeSA release could suppress the population increase of S. avenae apterae effectively from the heading to filling stages of wheat.
College of Plant Protection, Shandong Agricultural University, Tai'an 271018, Shandong, China. june.dj@163.com
Jie
J
Dong
Ying-Jie
YJ
Liu
Pei-Ling
PL
Li
Fang-Jing
FJ
Lin
Ju-Lian
JL
Chen
Yong
Y
Liu
D000383:Agriculture / Q000379:methods; D000818:Animals; D001042:Aphids / Q000187:drug effects / Q000254:growth & development / Q000502:physiology*; D001937:Brassica / Q000254:growth & development; D002681:China; D017753:Ecosystem; D010572:Pest Control, Biological; D010675:Pheromones / Q000494:pharmacology; D011235:Predatory Behavior; D012459:Salicylates / Q000737:chemistry*; D014908:Triticum / Q000254:growth & development / Q000469:parasitology*
D010675:Pheromones; D012459:Salicylates; C033069:methyl salicylate