Journal of Applied Entomology - Zeitschrift für angewandte Entomologie (1986) 101, 444-452
S. Gerlach and C. Sengonca (1986)
Fraßaktivität und Wirksamkeit des räuberischen Thrips, Scolothrips longicornis Priesner (Thysanoptera, Thripidae)
[Feeding activity and effectiveness of the predatory thrips, Scolothrips longicornis Priesner (Thysanoptera, Thripidae)]
Journal of Applied Entomology - Zeitschrift für angewandte Entomologie 101 (5), 444-452
Abstract: In the present study the feeding activity on Tetranychus cinnabarinus Boisd. of the immature and adult females of the predatory thrips, Scolothrips longicornis Priesner, as well as the fecundity were investigated at 3 different temperatures. At all temperatures during the immature stages females consumed between 58 and 64 T. cinnabarinus eggs, and thereby twice as many as did the male larvae. Temperature had no effect on the total prey consumption during development. At 15 °C and 25 °C the same number of mite eggs was killed by 1st- and 2nd-stage larvae as at 35 °C. Adult females of S. longicornis showed a high daily prey consumption of T. cinnabarinus eggs and a high daily fecundity, which increased with increasing temperature. At 15 °C females killed a maximum number of 55 mite eggs per day and laid a mean of 6 eggs. At 25 °C the mean daily prey consumption and fecundity were considerably higher and on the average a maximum of 90 mite eggs killed per day, whereby a mean of 9 to 10 eggs were laid per female and day. Both the feeding activity and oviposition further increased at 35 °C and reached a high of 130 mite eggs killed and 16 eggs laid per day. At all temperatures a close correlation was found between the feeding activity and fecundity. In the studies on the feeding activity on T. cinnabarinus nymphs the female thrips consumed a mean of 38 to 50 mite nymphs per day and the feeding activity remained at this level over the whole lifetime, which was strongly abbreviated. However, the mean daily fecundity curve showed a clear tendency with an increase at first and a following slow decline and thereby differed from the feeding activity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
(original language: German)
Link to article at publishers website
Database assignments for author(s): Cetin Sengonca
Research topic(s) for pests/diseases/weeds:
biocontrol - natural enemies
Research topic(s) for beneficials or antagonists:
general biology - morphology - evolution
Pest and/or beneficial records:
Beneficial | Pest/Disease/Weed | Crop/Product | Country | Quarant.
|
---|---|---|---|---|
Tetranychus cinnabarinus | Germany | |||
Scolothrips longicornis (predator) | Tetranychus cinnabarinus | Germany |