Evaluation of efficacy on dropped ripe fruit removal control of oriental fruit fly bactrocera dorsalis and fruit damage rate assessments of five mango varieties

Author of the article:YE W F，LI L，XIE C W，DONG W X，XIAO C

Author's Workplace：Plant Protection Institute，Yunnan Agricultural University，Yunnan，Kunming 650201，China

Key Words：Bactrocera dorsalis (Hendel), mango, infestation rate, dropped fruit removal

Abstract：          The rate of infestation of five major mango varieties by oriental fruit flies Bactrocera dorsalis (Hendel) had been assessed in Yuanjiang, Yunnan, from June to August, 2011. The results showed that two varieties (Sannianmang and Red ivory) had the highest rate of infestation and largest number of oviposition apertures. Additional test was conducted to evaluate the effectiveness of dropped fruit removal on the control of the flies. There was a significant positive correlation between the number of dropped fruits per square meter (X) and the number of male files (Y) captured by methyl eugenol (Me) (r1=0.884**, P1=0.000). The regression equation Y=-1.675+449.701X-204.933X2+27.046X3 (Rsq=0.966, sig.f=0.000) had been calculated. The relationship between accumulation of the number of male files captured by Me (X) and the average infestation rate of mango fruits (Y) can be expressed as Y=0.003X0.721 (Rsq=0.953，Sig.f=0.000). Compared with the control group, the infestation rate and the number of captured male flies in the treatment group were significantly reduced by 20% and 44%, respectively. Therefore, dropped fruit removal is recommended as an effective method of control of the pest.