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Regulation of dominant insect pests and natural enemies by intercropping tomato in cauliflower-based fields
Pages: 391-399
Year: Issue:  4
Journal: Acta Entomologica Sinica

Keyword:  Cauliflowertomatointercroppinginsect pestnatural enemy;
Abstract: 【Aim】It has been documented that intercropping with tomato,Lycopersicon esculentum,can suppress populations of the dominant insect pests in cauliflower( Brassica oleracea var. botrytis) fields.The present study aims to find the optimal ratio of tomato intercropped for protection of natural enemies and suppression of insect pests in cauliflower-based fields. 【Methods】The study was conducted in a provincial standard demonstration site located in Minqing County of central Fujian( 26°10’41″N,118°48’10″E). The experiment was designed with scaled-up intercropping ratios of 0%,10%,30% and 50%of tomato plants to the total plants in cauliflower-based fields,using a randomized-block arrangement.The species of arthropods and their numbers of individuals in the cauliflower fields were visually observed and recorded. 【Results 】 The results showed that the number of individuals of Lipaphis erysimi was significantly suppressed in the cauliflower-based intercropping fields and the inhibitory efficacy increased with increasing of the intercropping ratio of tomato( 50% > 30% > 10%). The number of individuals of Phyllotreta striolata decreased significantly in the intercropping fields with 30% and 50% tomato plants as compared to that in the monoculture system of cauliflower,but with no significant difference between the intercropping systems with 30% tomato plants and with 50% tomato plants. Intercropping with tomato had no effects on the numbers of individuals of Pieris rapae and spiders in the cauliflower-based fields.The number of individuals of Cotesia plutellae and the ratio of C. plutellae wasps to Plutella xylostella moths increased in the intercropping fields compared to those in the monoculture system of cauliflower,but with no significant differences among the three intercropping ratios. 【Conclusion 】 The 30%intercropping ratio of tomato plants is most optimal for the control of insect pests in cauliflower-based fields.
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