Neotropical Entomology (2008) 37, 646-650

Aline Nondillo, Luiza R. Redaelli, Marcos Botton, Silvia M.J. Pinent and Rogério Gitz (2008)
Exigências térmicas e estimativa do número de gerações anuais de Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) em morangueiro
[Thermal requirements and estimate of the annual number of generations of Frankliniella occidentalis (Pergande) (Thysanoptera: Thripidae) on strawberry crop]
Neotropical Entomology 37 (6), 646-650
Abstract: Frankliniella occidentalis (Pergande) is one of the major strawberry pests in southern Brazil. The insect causes russeting and wither in flowers and fruits reducing commercial value. In this work, the thermal requirements of the eggs, larvae and pupae of F. occidentalis were estimated. Thrips development was studied in folioles of strawberry plants at six constant temperatures (16, 19, 22, 25, 28 and 31°C) in controlled conditions (70 ± 10% R.H. and 12:12 L:D). The number of annual generations of F. occidentalis was estimated for six strawberry production regions of Rio Grande do Sul State based on its thermal requirements. Developmental time of each F. occidentalis stages was proportional to the temperature increase. The best development rate was obtained when insects were reared at 25ºC and 28ºC. The lower threshold and the thermal requirements for the egg to adult stage were 9.9ºC and 211.9 degree-days, respectively. Considering the thermal requirements of F. occidentalis, 10.7, 12.6, 13.1, 13.6, 16.5 and 17.9 generations/year were estimated, respectively, for Vacaria, Caxias do Sul, Farroupilha, Pelotas, Porto Alegre and Taquari producing regions located in Rio Grande do Sul State, Brazil.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: Portuguese)
Full text of article
Database assignments for author(s): Luiza R. Redaelli, Marcos Botton

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Frankliniella occidentalis	Strawberry (Fragaria)	Brazil (south)