Controlling effects of 40% chlorpyrifos·buprofezin organosilicon EC on Aleurodicus disperses Russell under field conditions

HUANG Chao-fu1,2, ZHANG Yang 3, ZENG Dong-qiang1 *(1 Agricultural College, Guangxi University, Nanning 530005, China; 2 Insititute of Termite Control, Nanning Real Estate Bureau, Nanning 530023, China; 3 Plant Protection Institute, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China)

40% chlorpyrifos·buprofezin EC; Aleurodicus disperses Russell; control effect

[Objective] The objective of the current study was to elucidate the controlling effects of spraying 40% chlorpyrifos·buprofezin organosilicon (EC) on Aleurodicus disperses Russell, and the duration of its effectiveness. [Method] Guava plants were sprayed with different concentrations of 40% chlorpyrifos·buprofezin organosilicon EC (500, 1000, 2000 times diluted) and 1000 times diluted 48% chlorpyrifos EC, 10% acetamiprid ME, 20% buprofezin EC, 2.5% bifenthrin EC and 4.5% beta-cypermethrin. Water and non-pesticide treatments were used as control, field test was conducted during the peak period of Aleurodicus disperses Russell adults. [Result] Spraying 40% chlorpyrifos·buprofezin organosilicon EC resulted in 100.0, 93.8 and 86.7% control of Aleurodicus disperses Russell after 1, 7,and 35 days after treatment, and no phytotoxic symptoms appeared on guava plants until 14 d after spray. [Conclusion] Field experiment results indicated that 40% chlorpyrifos·buprofezin EC had high control effects on Aleurodicus dispersus Russell. The spray was also not found harmful for the growth of guava plants. A thousand times of dilution of 40% chlorpyrifos·buprofezin EC may be recommended for application in guava orchards during the peak incidences of Aleurodicus disperses Russell adults.