Effects of different light environments on adult longevity and reproduction of oriental fruit moth Grapholita molesta
In order to elucidate the effects of light environments on the adult longevity and reproduction of oriental fruit moth Grapholita molesta,the experiments on measure the adult longevity,mating rate,pre-oviposition duration,oviposition duration,fecundity,egg duration,and hatching rate under different light intensities(10 000,1 000,100,1 and 0.01 mW/m2)and wavelength ranges(red light,630 nm;yel-low light,575 nm;green light,510 nm;blue light,455 nm;purple light,440 nm;and ultraviolet(UV)light,365nm)were conducted in the laboratory.The results showed that,compared to higher light inten-sities(10 000,1 000 and 100 mW/m2),lower intensities(1 mW/m2and 0.01 mW/m2)led to shorter adult longevity(＜15 d),reduced fecundity(51.44 and 51.02 eggs,respectively),and longer egg duration(3.36 d and 3.24 d,respectively).In addition,pre-oviposition and oviposition durations were extended under 1 mW/m2,with 3.80 d and 5.19 d,respectively.There was no significant difference in the mating rate and egg hatching rate under different light intensities.Compared to yellow,green and blue light,ex-posure to red and UV light resulted in shorter adult longevity(＜13 d),lower mating rates(54.45％and 65.56％,respectively),longer pre-oviposition periods(＞5.5 d),shorter oviposition period(＜6 d),and re-duced fecundity(38.34 and 57.60,respectively).Egg duration was shorter under red,blue and UV light(2.66,2.58 and 2.65 d,respectively),and egg hatching rate was the lowest under UV light(89.90％),which significantly lower than those under other wavelength ranges.The study indicates that light envi-ronment significantly affects the adult longevity and reproduction of G.molesta.Lower light intensity,as well as exposure to red and UV light,were found to inhibit reproductive ability,which may not be conducive to population development.These results offer insights into light environment setting for in-door breeding and the development of light trapping technology in the field.
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