Occurrence dynamic of Scirtothrips dorsalis Hood and its monitoring methods in mango orchard.
Chen YongSen, Huang GuoDi, Qin Chan, Li RiWang, Zhou JunAn, Chen HaoJun, Mo YongLong, Lan Wei
Author Affiliation: Guangxi Subtropical Crops Research Institute, Nanning 530001, China.
Journal of Southern Agriculture 45 : 1646-1652
Abstract : Objective: The occurrence rules in mango orchard and the optimal monitoring method for Scirtothrips dorsalis in different phenological periods of mango trees were studied to provide scientific references for its control and prevention. Method: From Feb. 20th to Nov. 30th in 2010 and 2012, two main planting mango varieties of Guangxi viz., Jinhuang mango and Guire mango No.82, in mango cultivar garden and demonstration park of Guangxi Subtropical Crops Research Institute were used to record Scirtothrips dorsalis dynamics during flowering period and fruitlet period using blue insect-attracting board (adding gyplure), blue insect-attracting board and shaking methods simultaneously. This dynamics was also recorded at fruit inflating stage to the last young shoot maturity for the year using blue insect-attracting board (adding gyplure). Effects of mango phonological period, climate conditions and cultivars on Scirtothrips dorsalis incidence were analyzed. Result: The peak stage occurred from full bloom to fruitlet period and at young shoot stage. At the end of the florescence, fruit expansion and young shoot maturity, population density of Scirtothrips dorsalis in field was down step by step. High temperature and dry climate environment was conducive to population occurrence and breeding. Scirtothrips dorsalis showed no selectivity preference to mango variety. The unary linear regression equation of the three monitoring methods was as follows: y=1.717x+14.321 [y: blue insect-attracting board (adding gyplure), x: shaking, R2=0.777, P0.05], y=1.256x+0.288 [y: blue insect-attracting board (adding gyplure), x: blue insect-attracting board, R2=0.979, P0.05] and y=1.375x+11.080 [y: blue insect-attracting board, x: shaking, R2=0.801, P0.05]. Conclusion: The occurring regularity of Scirtothrips dorsalis in field was closely related to mango phonological period and climate conditions, but it had no relations with mango variety. Monitoring methods had impacts on the monitoring results. Considering operative convenience, shaking method should be chosen from initial flowering period to fruitlet period while blue insect-attracting board (adding gyplure) should be applied in other phenological periods.