Nghiên cứu đáng giá tiềm năng ứng dụng của một số kẻ thù tự nhiên trong phòng chống sâu đục cuống quả vải Conopomorpha sinensis Bradley (1986) tại Bắc Giang Natural Enemies of Litchi Pod Borer Conopomorpha sinensis Bradley (Lepidoptera: Gracillariidae) and Potencial Application of Microbial Pesticides (Bacillus thuringiensis) in Biological Control at Luc Ngan Province
Lê Thế Anh, Nguyễn Văn Tuất, Nguyễn Văn Vịnh, Phạm Anh Tuấn Abstract Conopomorpha sinensis Bradley (Lepidoptera: Gracillariidae) is major insect pest on litchi and longan orchards in Bac Giang province, northern part of Vietnam. Chemical pesticides for control this pest are current applying in fruit-developing period have been raised the concern of enviromental issues as well as leaving the high level of residue in exporting product. In this research, on untreated fruit of litchi (Litchi chinensis) in Bac Giang province within fruit season from 16th March to 15th June, we recorded the natural infestation of fruit borer (Conopomorpha sinensis) increase gradually and reach the peak of 25 % in Luc Ngan and 29,17% in Luc Nam District at harvest. The parasite rate of C. sinensis larvae in untreated fruits were 22.82% in Luc Nam and 14.76% in Luc Ngan. The parasitoid species were Chelonus sp. (91.18-94.45%) and Phanerotoma sp. (5.55-8.82%) in Luc Ngan and Luc Nam districts respectively. Bacillus thuringiensis var. kurstaki (Delfin WG 32 BIU) applied for control of C. sinensis on the field has gained the result of reducing 57.45-67.31% of damage fruit whereas spaying Fipronil 95% (Regent 800 WG) reduced up 65.96- 75.00% of fruit losses compare to control (untreat) in Luc Ngan and Luc Nam Districts respectively.
Keywords:Conopomorpha sinensis Bradley, litchi (Litchi chinensis), Chelonus sp., Phanerotoma sp., Bacillus thuringiensis var. kurstaki, Bac Giang province, Northen Vietnam, pest control.