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Sensitivity of grapevine phenological stages to larvae of European grapevine moth, Lobesia botrana Den. et Schiff. (Lep., Tortricidae)
Author(s) -
Gabel B.,
Roehrich R.
Publication year - 1995
Publication title -
journal of applied entomology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.795
H-Index - 60
eISSN - 1439-0418
pISSN - 0931-2048
DOI - 10.1111/j.1439-0418.1995.tb01257.x
Subject(s) - biology , infestation , phenology , tortricidae , cultivar , larva , horticulture , instar , pest analysis , lepidoptera genitalia , botany
This study compares the sensitivity of different phenological stages of grapevine cultivars to infestation by larvae of the European grapevine moth, Lobesia botrana Den. et Schiff. The fructiferous organs of six cultivars: Cabernet Franc, Merlot, Cabernet Sauvignon, Sauvignon, Semillon and Müller Thurgau were infested at 5–10 days intervals from the beginning of the vegetative period, with a constant number of newly hatched L. botrana larvae (five per organ). After the larvae reached the fifth instar, the fructiferous organs were cut and each grape analysed according to the damage. Each organ was classified into one of three groups: I — no damage; II — traces of probing activity and III — traces of feeding activity. At the beginning of the vegetative period (stages D and E) the percentage of fructiferous organs with traces of feeding activity is relatively low (20–35% dependent on cultivar). From stage F onwards the number of bunches with traces of feeding activity progressively increases, reaching a maximum at stage H (78–93%). In all cultivars tested a period was clearly observed when the fructiferous organs were significantly (ANOVA procedure, P< 0.0001) unsuitable for infestation by freshly hatched larvae, and this corresponded to phenological stages I and J (8–35% of bunches with traces of feeding activity). The phenological stages following stage until harvest were again suitable for development of the larvae (50–95% of bunches in the group III), but with greater individual alter variability than observed for stages from F to H.