Abstract
Application of synthetic-insecticides against tephritid fruit flies on horticultural-crops increases cost of production and results
in biomagnification of their toxic residues in man through food chain. This necessitates to investigate some biorationals like
Insect Growth Regulators (IGRs) as their ecofriendly alternate.A laboratory bioassay was conducted to determine toxicity and
chemosterility impact of five IGRs viz., Methoxyfenozide, Lufenuron, Buprofezin, Pyriproxyfen and Fenoxycarb on
Bactrocera zonata through IGR treated adult diet. The results of sterility impacts of five IGRs indicated that Methoxyfenozide,
Fenoxycarb, Lufenuron, Pyriproxyfen and Buprofezin demonstrated approximately 37.5, 34.8, 30.9, 25.1 and 22.4% reduction
in fecundity; 65.9, 67.3, 67.8, 72.2, and 72.9% less hatchability; 29.4, 25.8, 22.2, 17.6 and 16.1% less sperm concentration
liberated from testes; 31.2, 28.4, 25.9, 19.2 and 17.5% less sperm concentration liberated from spermatheca; and 36.2, 32.2,
27.8, 20.8 and 19.6% less egg concentration liberated from ovaries of B. zonata over control treatment, respectively. Similarly,
lethal concentration (LC) values for fifty percent reduction in fecundity, testes sperm concentration, spermathecal sperm
concentration and ovarian egg concentration in B. zonata were 0.44, 0.43, 0.68, 1.31 and 0.85% for Methoxyfenozide; 0.50,
0.51, 1.19, 1.75 and 1.06% for Fenoxycarb; 0.50, 0.62, 1.25, 2.52 and 1.54% for Lufenuron; 0.97, 0.83, 2.26, 4.11 and 2.52%
for Pyriproxyfen; and 1.05, 0.91, 2.38, 4.33 and 2.68% for Buprofezin, respectively. The mortality results indicate that
Methoxyfenozide, Fenoxycarb, Lufenuron, Pyriproxyfen, and Buprofezin explained 37.5 (0.44% LC50), 34.7 (0.50% LC50),
30.9 (0.50% LC50), 25.1 (0.97% LC50) and 22.5% (1.05% LC50) mortality in adult B. zonata, respectively. Overall,
Methoxyfenozide proved more toxic and had higher chemosterility impacts on B. zonata followed by Fenoxycarb, Lufenuron,
Pyriproxyfen, and Buprofezin. On the basis of these findings, it is concluded that Methoxyfenozide has maximum toxic and
chemosterility impacts on both male and female B. zonata, so can be a better eco-friendly biorational for fruit fly management
in Pakistan
Muhammad Junaid Nisar, Shahbaz Talib Sahi, Muhammad Dildar Gogi, Muhammad Jalal Arif. (2020) TOXICITY AND CHEMOSTERILITY IMPACT OF INSECT GROWTH REGULATORS BAITED DIET ON ADULT PEACH FRUIT FLY, Bactrocera zonata (SAUNDERS) (DIPTERA: TEPHRITIDAE), Pakistan Journal of Agricultural Sciences, Volume 57, Issue 4.
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