Toxicity Tests and Field Efficacy of Several Pesticides Against Adult and Nymph of Diaphorina citri Kuwayama
《北方园艺》[ISSN:1001-0009/CN:23-1247/S]
- Issue:
- 2019年01
- Page:
- 1-6
- Research Field:
- Publishing date:
Info
- Title:
- Toxicity Tests and Field Efficacy of Several Pesticides Against Adult and Nymph of Diaphorina citri Kuwayama
- Author(s):
- LI Xingtao; DUAN Huihui; TONG Xiaonan; ZHONG Balian; WU Min; LI Wei
- (College of Life Sciences, Gannan Normal University/National Navel Orange Engineering Research Center, Ganzhou, Jiangxi, 341000)
- Keywords:
- Toxicity Tests and Field Efficacy of Several Pesticides against Adult and Nymph of Diaphorina citri KuwayamaLI Xingtao; DUAN Huihui; TONG Xiaonan; WU Min; LI Wei
- PACS:
- -
- DOI:
- 10.11937/bfyy.20182165
- Abstract:
- Diaphorina citri was used as target, laboratory toxicity and field efficacy testing were conducted by using dipping and spraying methods to determine the efficacy of several insecticides for control of adult and nymph of Diaphorina citri Kuwayama in order to provide a scientific basis for selecting pesticides to control the Diaphorina citri Kuwayama and Huanglongbing (HLB, citrus greening). The results showed that the LC50 values of all tested pesticides insecticides to nymphs were higher than to adult. 55% cypermethrin chlorpyrifos EC showed the maximal difference in toxicity between adults and nymphs, and LC50 values of 55% cypermethrin chlorpyrifos EC to adults than nymphs was 1.46 times. The 20% carbosulfan EC have lowest difference in toxicity between adults and nymphs, and LC50 values of 20% carbosulfan EC to adults than to nymphs was 1.15 times. The control effect of six insecticides to adults was average higher 7.29% than that of nymphs after 9 days the insecticides sprayed on satsuma orange. 4.5% beta-cypermethrin EC, 55% cypermethrin chlorpyrifos EC, 20% clothianidin SC and 10% imidacloprid SP had higher control effect on adults than nymphs. However, after 9 days spraying insecticides with cutting off the shoot tips, the control effect of six insecticides to adults was average higher only 1.99% than that of nymphs. There was no significant difference between the control effect of six insecticides to adult and nymphs after 9 days spraying insecticides with cutting off the shoot tips. It implied that young nymphs was protected inside the newly developing unfolded leaves where Diaphorina citri oviposited, therefore some nymphs avoided contact with the spray and reduce control effect of insecticides to nymphs. Suggestions on shoot tips should been heavily sprayed with insecticides, and using compound and systemic insecticides are effective in killing nymphs.
Last Update: 2018-11-01