Calag Archive

New wasp may help control navel orangeworm

by E. Fred Legner, Gordon Gordh, Aquiles Silveira-Guido, Max E. Badgley

Abstract

A tiny parasitic wasp imported from South America shows potential for economic control of this important pest of almonds. (Photo by Max E. Badgley)

Discovered in South America, the wasp attacks navel orangeworm larvae in hullsplit and mummy almonds.

Midwinter irrigation can reduce deep bark canker of walnuts

by G. Steven Sibbett, Beth L. Teviotdale

Abstract

Supplementing low rainfall with midwinter irrigation dramatically reduced deep bark canker.

Cabbage aphid control on Brussels sprouts and broccoli

by Norman F. McCalley

Abstract

An experimental insecticide gave the best control in Salinas Valley Brussels sprouts and broccoli.

A master plan for drainage in the San Joaquin Valley

by Blaine R. Hanson

Abstract

Solution of subsurface drainage problems in the heavily irrigated valley is complex but vital if the cropland is to remain productive.

About 400,000 acres of irrigated land now have drainage problems, and affected acreage is increasing.

Nutritive value of chaparral for goats grazing in fuel-breaks

by Ahmed E. Sidahmed, Steven R. Radosevich, James G. Morris, Ling J. Koong

Abstract

Goats, used for fuel-break maintenance in chaparral, browsed scrub oak most and manzanita least, choosing the most nutritive plant parts.

Spanish goats, used for fuel-break maintenance in chaparral after fire, browsed resprouting vegetation, selecting most nutritive plant parts. Goat with harness (right) is one of esophageal fistulated animals from which samples were collected daily. At far right is resprouting scrub oak and chamise at U.S. Hopland Field Station, Mendocino County; below, goats in test plot at Tragedy Springs, Cleveland National Forest, San Diego County.

Chemicals losing effect against grape mealybug

by Donald L. Flaherty, Larry Bettiga, George M. Leavitt, William L. Peacock

Abstract

Field tests verified reports of problems in achieving satisfactory control of mealybug with chemicals.

Polyethylene tarping controls verticillium wilt in pistachios

by Lee J. Ashworth, Santiago A. Gaona, Arthur H. McCain, David P. Morgan

Abstract

Polyethylene tarping applied to pistachio groves in summer is expensive but practical, killing the wilt fungus to a 4-fOOt depth.

Trees as energy crops

by Dean R. Donaldson, Richard B. Standiford

Abstract

Field-tested as energy crops in Napa County, two eucalyptus species produced an estimated 25 to 32 million Btu per acre per year.

Walnut aphid becoming a costly midsummer pest

by G. Steven Sibbett, Marion Bailey, Larry Bettiga

Abstract

Usually considered a cool-weather pest, walnut aphids can also be an economic hazard when it's hot.

Controls for codling moth suppress aphid parasite, allowing undisturbed population growth.

Radioactive measurement of brown mite injury on avocados

by Frank V. Sances, Michael P. Hoffmann, Larry F. LaPr, J. Blair Bailey, Marshall W. Johnson, Nick C. Toscano

Abstract

Dual-isotope porometer correlates mite feeding with reduced transpiration and photosynthesis rates.

New wasp may help control navel orangeworm

by E. Fred Legner, Gordon Gordh, Aquiles Silveira-Guido, Max E. Badgley

Abstract

A tiny parasitic wasp imported from South America shows potential for economic control of this important pest of almonds. (Photo by Max E. Badgley)

Discovered in South America, the wasp attacks navel orangeworm larvae in hullsplit and mummy almonds.

Midwinter irrigation can reduce deep bark canker of walnuts

by G. Steven Sibbett, Beth L. Teviotdale

Abstract

Supplementing low rainfall with midwinter irrigation dramatically reduced deep bark canker.

Cabbage aphid control on Brussels sprouts and broccoli

by Norman F. McCalley

Abstract

An experimental insecticide gave the best control in Salinas Valley Brussels sprouts and broccoli.

A master plan for drainage in the San Joaquin Valley

by Blaine R. Hanson

Abstract

Solution of subsurface drainage problems in the heavily irrigated valley is complex but vital if the cropland is to remain productive.

About 400,000 acres of irrigated land now have drainage problems, and affected acreage is increasing.

Nutritive value of chaparral for goats grazing in fuel-breaks

by Ahmed E. Sidahmed, Steven R. Radosevich, James G. Morris, Ling J. Koong

Abstract

Goats, used for fuel-break maintenance in chaparral, browsed scrub oak most and manzanita least, choosing the most nutritive plant parts.

Chemicals losing effect against grape mealybug

by Donald L. Flaherty, Larry Bettiga, George M. Leavitt, William L. Peacock

Abstract

Field tests verified reports of problems in achieving satisfactory control of mealybug with chemicals.

Polyethylene tarping controls verticillium wilt in pistachios

by Lee J. Ashworth, Santiago A. Gaona, Arthur H. McCain, David P. Morgan

Abstract

Polyethylene tarping applied to pistachio groves in summer is expensive but practical, killing the wilt fungus to a 4-fOOt depth.

Trees as energy crops

by Dean R. Donaldson, Richard B. Standiford

Abstract

Field-tested as energy crops in Napa County, two eucalyptus species produced an estimated 25 to 32 million Btu per acre per year.

Walnut aphid becoming a costly midsummer pest

by G. Steven Sibbett, Marion Bailey, Larry Bettiga

Abstract

Usually considered a cool-weather pest, walnut aphids can also be an economic hazard when it's hot.

Controls for codling moth suppress aphid parasite, allowing undisturbed population growth.

Radioactive measurement of brown mite injury on avocados

by Frank V. Sances, Michael P. Hoffmann, Larry F. LaPr, J. Blair Bailey, Marshall W. Johnson, Nick C. Toscano

Abstract

Dual-isotope porometer correlates mite feeding with reduced transpiration and photosynthesis rates.

Calag Archive

Calag Archive

Peer-reviewed research and review articles

News and opinion

Peer-reviewed research and review articles

News and opinion