Environmental Entomology (1983) 12, 66-70

G.C. Rock, P.L. Shaffer and A.D. Shaltout (1983)
Tufted apple budmoth (Lepidoptera: Tortricidae): Photoperiodic induction of larval diapause and stages sensitive to induction
Environmental Entomology 12 (1), 66-70
Abstract: A photoperiodically controlled larval diapause of the short-day, long-day type was identified in tufted apple bud moth, Platynota idaeusalis (Walker). Pupae obtained from diapause and nondiapause larvae reared at 21°C were similar in weight; however, heart rates of diapause larvae were significantly lower than those of nondiapause larvae. Induction of larval diapause was dependent upon both photoperiod and temperature. The critical short-day photoperiod at 21°C was between 1 and 3 h for a Pennsylvania strain. The long-day critical photoperiod at 21°C was ca. 14 h for both Pennsylvania and North Carolina strains. Diapause at a short daylength was averted entirely at 32°C in a Pennsylvania strain. There was no difference in the incidence of diapause in progeny of adults and eggs reared under naturally decreasing short daylengths versus a constant daylength. Sensitivity to a diapause-inducing photoperiod did not occur at any one particular stage in larval development. A maximum of 39% diapause occurred when four of the five larval instars were exposed to a short daylength, and 100% diapause occurred when all five instars were exposed to a short daylength.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)

Research topic(s) for pests/diseases/weeds:
general biology - morphology - evolution
population dynamics/ epidemiology

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Platynota idaeusalis		U.S.A. (NE)
	Platynota idaeusalis		U.S.A. (SE)