Effects of Sublethal Concentrations of Insecticides on Survival and Reproduction of TwoBactroceraSpecies (Diptera: Tephritidae)

Author:

Nian Xiaoge1ORCID,Luo Yaru1,Ye Hui1,He Xinyu1,Wu Shujie1,He Yurong123,Wang Desen143ORCID

Affiliation:

1. Department of Entomology, South China Agricultural University , Guangzhou 510642 , China

2. Key Laboratory of Bio-Pesticide Innovation and Application , Guangzhou 510642 , Guangdong Province , China

3. Engineering Research Center of Biological Control, Ministry of Education , Guangzhou 510642 , China

4. Key Laboratory of Bio-Pesticide Innovation and Application , Guangzhou 510642, Guangdong Province , China

Abstract

AbstractThe melon fruit fly, Bactrocera cucurbitae (Coquillett) and the pumpkin fruit fly, Bactrocera tau (Walker) (Diptera: Tephritidae), are important invasive pests on Cucurbitaceous hosts. The acute toxicity of five insecticides to females of these two fruit fly species was bio-assayed by membrane method, and effects of their sublethal concentration on the survival, reproduction, and ovary development of females were evaluated in the laboratory. Results showed that based on the LC50 values, both B. cucurbitae and B. tau were the most susceptible to trichlorfon. After treatment with sublethal concentration (LC30) of trichlorfon, abamectin+β-cypermethrin, spinetoram, and lambda-cyhalothrin, the female survival days of the two Bactrocera species were significantly shortened compared with the control. Moreover, the fecundity of two Bactrocera species was remarkably decreased, after exposure to abamectin+β-cypermethrin and trichlorfon LC30. However, the sublethal concentration (LC30) of insecticides had no significant influence on the egg hatchability of the fruit flies. Furthermore, after treatment with abamectin+β-cypermethrin LC30, the ovary length, width, and egg load of B. cucurbitae were significantly lower than that of the control; however, only the ovarian length and egg load of B. tau were significantly decreased on the 16th and 20th day. In conclusion, abamectin+β-cypermethrin has an excellent insecticidal activity against B. cucurbitae and B. tau.

Funder

Guangdong Provincial Special Fund for Modern Agriculture Industry Technology Innovation Teams

Publisher

Oxford University Press (OUP)

Subject

Insect Science,Ecology,General Medicine

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