PT  - JOURNAL ARTICLE
AU  - R. W. DeHaven
AU  - R. L. Hothem
TI  - Estimating Bird Damage from Damage Incidence in Wine Grape Vineyards
AID  - 10.5344/ajev.1981.32.1.1
DP  - 1981 Jan 01
TA  - American Journal of Enology and Viticulture
PG  - 1--4
VI  - 32
IP  - 1
4099  - http://www.ajevonline.org/content/32/1/1.short
4100  - http://www.ajevonline.org/content/32/1/1.full
SO  - Am J Enol Vitic.1981 Jan 01; 32
AB  - Bird damage was measured during 1977 and 1978 at 32 wine grape vineyards in the San Joaquin Valley and North Coastal Region of California. Both the percentage bird loss (PBL) and the percentage of bunches damaged (BDI = bird damage incidence) were determined during 55 total-damage assessments, and the resulting data pairs were used to develop a regression of PBL on BDI. The final prediction equation was loge (PBL + 1) = 0.0385 BDI, for which the SE = 9.6297 10-4, and it accounted for 97% of the observed variation. We conclude that by using that equation, reasonably accurate predictions of PBL can be obtained from relatively quick and inexpensive estimates of BDI. Guidelines for the use of the prediction method and the accuracy of some PBL predictions are discussed.