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Second generation of grape berry moths, Lobesia botrana (Den. & Schiff.) (Lep., Tortricidae) and Eupoecilia ambiguella (Hb.) (Lep., Cochylidae): spatial and frequency distributions of larvae, weight loss and economic injury level
Author(s) -
Pavan F.,
Girolami V.,
Sacilotto G.
Publication year - 1998
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.1439-0418.1998.tb01513.x
Subject(s) - biology , berry , tortricidae , larva , poisson distribution , horticulture , pest analysis , lepidoptera genitalia , spatial distribution , botany , statistics , mathematics
Spatial and frequency distributions of grape berry moth larvae were studied in vineyards of northeastern Italy. The larval density varied in relation to position of grape clusters within vines. For density values below 0.5 larval nests per cluster, the larvae were almost randomly distributed and fit the Poisson distribution, while above 0.5 larval nests per cluster were slightly aggregated and fit the negative binomial distribution better. A new method to estimate cluster weight loss cause by second generation of grape berry moths, based on weighing and counting of berries injured, was proposed. Therefore an estimate of economic injury level based on this method was put forward.