Acarologia (2003) 43, 59-65

Nancy Mabel Greco and Norma Elba Sanchez (2003)
Effects of previously damaged strawberry plants on Tetranychus urticae Koch (Acari: Tetranychidae)
Acarologia 43 (1), 59-65
Abstract: We report the effect of initial damage on subsequent populations of Tetranychus urticae Koch in two strawberry cultivars. In 'Selva' cultivar the damage levels assayed were 622.50 and 2458.75 mite-days/plant. In 'Milsei Tudla' they were 1157.80, 2339.15 and 4101.20 mite-days/plant. After the damage, the plants were kept free of mites during 15 days. Then, excised leaves of 'Selva' plants and whole 'Milsei Tudla' plants were infested with 10 females, counting the offpring at different intervals. In 'Selva' cultivar, the number of eggs and immatures of T. urticae as well as the egg-days/female-days ratio were higher in plants exposed to the highest level of damage. This effect was not detected in 'Milsei Tudla'. The stage survival rates and the duration of stages were unaffected by previous damage in both cultivars. The demographic pattern found in 'Selva' cultivar suggests that induced susceptibility against T. urticae is due primarily to differences in fecundity.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Database assignments for author(s): Nancy Mabel Greco

Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Tetranychus urticae	Strawberry (Fragaria)