The role of castor bean, Ricinus communis Willd. as a banker plant of acaraphagous ladybird beetle, Stethorus gilvifrons Mulsant (Col.: Coccinellidae) in biological control of sugarcane mite

Document Type : Research Paper

Authors

1 Plant Protection Department, Faculty of Agriculture, Shahed University, Tehran

2 Plant Protection Department, Khouzestan Sugarcane & by Product Research & Training Ins. Ahvaz

Abstract

Acariphagous ladybird beetle, Stethorus gilvifrons Mulsant (Col., Coccinellidae) feeds on various growth stages of the tetranychus mites. Since Eutetranychus orientalis (Klein) mite is actively seen on castor bean crops during the months of autumn, winter and spring seasons, so it can be considered as a suitable host for maintaining ladybird beetles. Hence, the ladybird beetle population can be prevented from migration and maintained until the outbreak of sugarcane mite. In this study, possible use of castor bean, Ricinus communis Wild. (Euphorbiaceae) has been considered as a banker plant of acaraphagous ladybird beetle, S. gilvifrons. Initially, 30 castor bean plants were cultivated in the month of August 2016 around sugarcane fields in Khuzestan province and the population of mites and ladybird beetles were monthly sampled during one year (2016-2017) starting from August. The results showed ladybird beetles activity on castor bean plant throughout the year, however, during November till March only adults were observed that could start reproduction only from April to September. Also, the data analysis of the olfactometry system showed that the reaction of the ladybird beetle to volatile compounds of castor bean is significant. Therefore, the castor bean has the potential to form a niche for the acaraphagous ladybird beetle in maintaining its population throughout the year in order to control sugarcane mite population more efficiently and timely.

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