Effects of Temperature on Adult Longevity, Fertility, and Rate of Transovarial Passage of Rice Stripe Virus in the Small Brown Planthopper, Laodelphax striatellus FALLEN (Homoptera : Delphacidae)

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Adults of the small brown planthopper which is a vector of rice stripe virus (RSV), were reared under 17.5,25.0℃, and their fertility, longevity and the rate of viruliferous nymphs of the next generation were investigated. The mean adult longevities of females were 44.8,27.0,20.3 days and those of males were 45.9,26.5,16.9 days at 17.5,25.0,32.5℃, respectively. The mean fertility at 25.0℃ was the highest (289.0 hatchlings), which was not significantly different from that at 17.5℃ (251.9), but the fertility at 32.5℃ was low (69.5). Most of the females at 17.5℃ showed high transovarial passage, i.e. 82.6% of viruliferous females passed RSV to progeny at the rate of more than 90%. The pernentage of females which showed high transovarial passage (>90%) was 60.9% at 25℃ and 12.5% at 32.5℃; the higher the rearing temperature, the lower the percentage was. The lower rates of transovarial passage were observed from the begining of oviposition at both 25.0 and 32.5℃, and the rate decreased with the age of females especially at 35.5℃. RSV had no deleterious effect on the fertility or adult longevity of the vector.
1988-02-25