Botryosphaeriaceae species affecting table grape vineyards in Chile and cultivar susceptibility

Management of Mineral Nutrition in Table Grape Vineyards

Introduction An understanding of the seasonal uptake and partitioning of mineral nutrients of grapevines is essential in order to time fertilizer applications. Over the last three decades, several important studies were conducted to determine seasonal nutrition demands of field-grown grapevines and to quantify the partitioning of mineral nutrients (Christensen 1980, Conradie, 1981, Peacock, 198...

Grape Detection in Vineyards

Feasibility of using pyranometers for continuous estimation of ground cover fraction in table grape vineyards

This paper evaluates the feasibility of using pyranometers for continuous estimation of ground cover fraction (GCF) at remote, unattended sites. Photographical techniques were used for measuring GCF (GCFref) at a table grape vineyard grown under a net. Daily pyranometer-driven GCF estimates (GCFpyr) were obtained from solar radiation measurements above and below the canopy. For GCFpyr computati...

Comparison of Sampling Methods Used to Estimate Spider (Araneae) Species Abundance and Composition in Grape Vineyards

The effectiveness of 3 methods for sampling spiders in grape vineyards was tested. The sampling methods were as follows: (1) a drop-cloth method in which spiders were dislodged from a 5.1-m2 area of grapevine onto a drop cloth, (2) a funnel method in which spiders were dislodged into a 0.74-m2 funnel, and (3) a D-vac method in which 50 sections of grapevine (3D-em sections, total area of 5.4 m2...

Spider (Araneae) Species Composition and Seasonal Abundance in San Joaquin Valley Grape Vineyards

Environ. Entornol. 24(4): 823-831 (1995) ABSTRACT As part of an investigation to estimate the effect of resident spider populations on Erythroneura vatiabilis Beamer, spider species composition, relative abundance, and sea­ sonal occurrence were determined. Spiders were sampled monthly during the 1992 and 1993 growing seasons; their numbers were pooled and analyzed for species diversity using t...