Tropisms Of Chafer To Different Plant Leaves And Screening Of Attractant

This paper does researches on the major underground pests-white grubs that damage the crops seriously in Henan province and some regions all over the country, in order to control the pests on the ground instead of underground, based on the relation of insect and plant, and insect chemical communication, some preliminary works about attracting of several plants to beetles were conducted both in laboratory and in the field, and the main results are summarized as follows:The selective response of Holotrichia oblita to different plants in the field. There were obviously more chafers near the castor-oil plant than soybean, cotton, sweet potato, peanut, elm, Abutilon theophrasti Medic, there was significant difference between them. The result showed that the castor-oil plant is highly attractive to Holotrichia oblita.The selective response of Holotrichia oblita to different plant volatiles (1) By steam distillation and dichloromethane, in the Y-tube olfactometer bioassay, the crude extract from castor-oil plant leaves was obviously attractive to female and male of Holotrichia oblita than cotton, Abutilon theophrasti Medic, control dichloromethane. But between the crude extract of castor-oil plant leaves and Buxus microphylla's were not obvious difference in attracting to male of Holotrichia oblita. The result showed the crude extract of castor-oil plant leaves contains some active substances which are attractive to Holotrichia oblita. (2) To Holotrichia oblita, Cinnama ldehyde, Dibutyl phthalate, phenol, Venillin, Benzaldehyde were more obviously attractive than cis-3-hexen-1-ol.The selective response of three chafers to different plant leaves The number of beetles caught by castor-oil plant leaves were obviously more than that of control filter paper, cotton, sweet potato, soybean, Abutilon theophrasti Medic, peanut and elm leaves. There was significant difference between them. The result showed that the castor-oil plant leaves were obviously active to Holotrichia oblita.Feeding behaviors of beetles to different plant leaves Feeding behaviors of Holotrichia oblita, Anomala corpulenta, Holotrichia parallela Motschulsky to...