Agricultural and Forest Entomology (2018) 20, 420-432

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Fatemeh Kiaeian Moosavi, Elena Cargnus, Francesco Pavan and Pietro Zandigiacomo (2018)
Effects of grapevine bunch exposure to sunlight on berry surface temperature and Lobesia botrana (Lepidoptera: Tortricidae) egg laying, hatching and larval settlement
Agricultural and Forest Entomology 20 (3), 420-432
Abstract: 1. Bunch-zone leaf removal reduced infestation by Lobesia botrana, although the mechanism responsible for this effect is unknown.
2. Based on the mortality of eggs and newly-hatched larvae exposed to high temperatures (>37 °C) in the laboratory, the present study aimed to assess the influence of (i) bunch-zone leaf removal and grapevine-row orientation on berry surface temperature and (ii) bunch exposure to sunlight on egg and larval mortality.
3. Berry temperatures were measured using a noncontact infrared thermometer in two vineyards and showed that, in direct sunlight, the temperatures of berry surfaces were 9 °C or more above air temperature, and the highest mean temperatures occurred on southwest-side bunches followed by west- and south-side bunches.
4. The results of four two-choice field assays, carried out confining fertile females in cages with two bunches, one exposed and one non-exposed to sunlight, showed that: (i) the females did not avoid laying eggs on sun-exposed bunches and (ii) the lowest percentages of both egg-hatching and larval settlement occurred on sun-exposed bunches.
5. The hypothesis that the high temperatures reached by sun-exposed berries cause egg and especially larval mortality is confirmed.
6. Bunch-zone leaf removal combined with optimized grapevine-row orientations can improve L. botrana control.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Francesco Pavan, Pietro Zandigiacomo, Elena Cargnus

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

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Lobesia botrana Grapevine (Vitis)