Comparison of the Effects of Pesticide Application on Biston suppressaria Larvae in Different Damage Stages

• Published in: Plant diseases and pests 2021-06, Vol.12 (3), p.1-8
• Main Authors: Lin, Hezai, Cai, Shouping, He, Xueyou, Zeng, Liqiong, Song, Haitian, Wu, Qingquan
• Format: Article
• Language: English
• Subjects: Biston; Branches; Chemical control; Feeding; Forests; Herbivores; Larvae; Pesticide application; Pesticides; Pests; Population density
• ISSN: 2152-3932
• DOI: 10.19579/j.cnki.plant-d.p.2021.03.001

Keywords Biston suppresaria; Larvae; Chemical control; Control effect Eucalyptus is an important timber tree species featured by barren tolerance, fast growth, high yield, short cycle, good economic benefit, etc., and has been planted in a large area in Guangxi, Fujian, Guangdong and other regions in southern China111. Meantime, delayed control can easily lead to the situation of excessive application of pesticides and continuous occurrence of pests. [...]the differences of prevention and control effect in different stages were compared, in order to provide scientific basis for determining the optimal control stage. 1Materials and Methods 1.1 General situation of experimental site The test was conducted in Dongfang Field, Tanyang Village, Changqiao Town, Zhangpu County, Fujian Province. 1.4 Survey of control effects Thepopulation density in the forest was investigated by the method of sample branches, that is, sampling plants were selected in the shape of "Z" in the forest, and standard sample branches with a length of 50 cm were cut from the sample trees to count the number of insect populations on sample branches. Zheng18] found that the feeding amount of the 5th to 6th instar larvae accounted for 87.36% of the total feeding amount. [...]the feeding amount of B. suppresaria larvae increased sharply with the increase of larval instar, especially the 5th to 6th instar larvae, which accounted for more than 85% of the total feeding amount of the larvae.