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California Polytechnic State University, San Luis Obispo

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Agriculture

Wine and Viticulture

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Articles 1 - 4 of 4

Full-Text Articles in Life Sciences

Regulated Deficit Irrigation Effect On Yield And Wine Color Of Cabernet Sauvignon In Central California, Michael J. Costello, W. Keith Patterson Oct 2012

Regulated Deficit Irrigation Effect On Yield And Wine Color Of Cabernet Sauvignon In Central California, Michael J. Costello, W. Keith Patterson

Wine and Viticulture

Regulated deficit irrigation (RDI) is a management strategy that on grape can improve shoot/fruit ratio, water efficiency, and wine quality but has the potential to reduce yield. As part of a study on the influence of RDI on leafhopper density, we evaluated the effects on grape yield, berry size, berry soluble solids, and wine color. The studies were conducted at commercial vineyards in the San Joaquin Valley and in the Paso Robles region, CA, with Cabernet Sauvignon as the cultivar. Water deficits were imposed at either 50% (moderate deficit) or 25% (severe deficit) of standard irrigation (the control) for ...


Influence Of Intensity And Duration Of Regulated Deficit Irrigation On Erythroneura Elegantula (Hemiptera: Cicadellidae) On Grape, Michael J. Costello, Shawn T. Veysey Aug 2012

Influence Of Intensity And Duration Of Regulated Deficit Irrigation On Erythroneura Elegantula (Hemiptera: Cicadellidae) On Grape, Michael J. Costello, Shawn T. Veysey

Wine and Viticulture

We conducted studies in a Paso Robles, CA, grape (Vitis vinifera L.) vineyard in 2002 and 2003 to estimate the impact of regulated deficit irrigation (RDI) intensity and duration on western grape leafhopper, Erythroneura elegantula Osborn. Treatments were based on deficit intensity, 50 and 25% of standard irrigation (moderate and severe deficits, respectively), and deficit duration, 3 or 6 wk time, initiated at the grape phenological stage of berry set.The standard irrigation served as the control, and was intended to be as close to 100% of evapotranspiration (1.0 ETc) for grape in this area. Each week we took ...


Grapevine And Soil Water Relations With Nodding Needlegrass (Nassella Cernua), A California Native Grass, As A Cover Crop, Michael J. Costello Apr 2010

Grapevine And Soil Water Relations With Nodding Needlegrass (Nassella Cernua), A California Native Grass, As A Cover Crop, Michael J. Costello

Wine and Viticulture

Nodding needlegrass [Nassella cernua (Stebbins & R.M. Love) Barkworth], a California native perennial grass, was tested for its effects on grapevine and soil–water relations in a drip-irrigated vineyard in Parlier, CA. Vine water status and in-row and between-row soil moisture (at 0.3 m, 0.6 m, 0.9 m, 1.2 m, and 1.5 m) were monitored semiweekly from June to September. There was no overall significant difference in leaf water potential between treatments. In-row soil moisture was lowest at depths of 0.6 m to 0.9 m within the nodding needlegrass treatment but was lowest ...


Growth And Yield Of Cultivated Grape With Native Perennial Grasses Nodding Needlegrass Or California Barley As Cover Crops, Michael J. Costello Jan 2010

Growth And Yield Of Cultivated Grape With Native Perennial Grasses Nodding Needlegrass Or California Barley As Cover Crops, Michael J. Costello

Wine and Viticulture

Two California native perennial grasses, nodding needlegrass [Nassella cernua (Stebbins & R.M. Love) Barkworth] and California barley [Hordeum brachyantherum Nevski ssp. californicum (Covas & Stebbins) Bothmer, N. Jacobsen & Seberg], were compared with a conventional grass cover crop, ‘Blando’ brome (Bromus hordeaceus L.), as well as resident (weedy) vegetation and a clean cultivated control for effects on growth and yield of cultivated grape (Vitis vinifera L. cv. Barbera). Statistical analyses did not reveal yield differences between treatments with floor vegetation (the native grasses, ‘Blando’ brome, and resident vegetation) and clean cultivation, the cover crop treatments (the native grasses and ‘Blando brome’) and ...