Calag Archive

March-April 1982
Volume 36, Number 2

Peer-reviewed research and review articles

Grapevines show seasonal differences in susceptibility to eutypa

by Curtis H. Petzoldt, William J. Moller, Mary Ann Sall

Abstract

Produced in masses of these dark fruiting bodies on old, dead wood, Eutypa spores are the source of grapevine dieback disease. Rain causes the fruiting bodies to disgorge thespores, which drift onto new pruning wounds in vineyards. (Photo by Jack Kelly Clark)

Early-winter pruning results in the highest probability of infection; March pruning, the least.

Chemical control of phomopsis grapevine cane and leaf spot disease

by Jim D. Cucuzza, Mary Ann Sall

Abstract

Dormant and properly timed foliar chemical treatments reduced severity of phomopsis disease in a two-year vineyard study.

Dormant or spring chemical applications controlled phomopsis

Vineyard cultural practices may help reduce botrytis bunch rot

by Steven D. Savage, Mary Ann Sall

Abstract

The two-wire trellis, midseason hedging, and a bloom-time fungicide spray each was associated with reduced bunch rot in vineyard tests.

Two-wire trellising and midseason hedging help minimize botrytis bunch rot, possibly by influencing the vine's microclimate.

Observations on Bodmin Nu-Pulse milking system

by Thomas A. Shultz, Richard N. Eide, Larry S. Collar

Abstract

The Bodmin self-adjusting vacuum pulsation unit performed satisfactorily, provided cleaning procedures were followed carefully.

Trunk injection corrects iron deficiency in plum trees

by Frank T. Yoshikawa, Wilbur O. Reil, Leslie K. Stromberg

Abstract

Injecting a ferrous sulfate solution into trunks of three-year-old plum trees corrected iron deficiency symptoms for two years.

Injections of ferrous sulfate appear to alleviate iron deficiency for about two years at a cost of 3 per tree.

Celery yields and uniformity are affected by pre-transplant practices

by Norman C. Welch, John W. Inman

Abstract

Eliminating weak and very vigorous celery plants before transplanting and keeping roots moist improved yield and uniformity.

Growers can select for easy-to-handle transplants without significantly reducing yield or increasing stalk size variation.

Two insects offer potential biological control of common purslane

by Stephen L. Clement, Robert F. Norris

Abstract

The purslane sawfly and portulaca leafmining weevil feed on the weed, apparently reducing its competitiveness and seed production.

They stress the weeds, reducing their vigor and seed production.

Mites: A primary food source for two predators in San Joaquin Valley cotton

by D. Gonzlez, Bonnie Ruth Patterson, Thomas F. Leigh, L. Theodore Wilson

Abstract

Cotton field trials suggest that economic thresholds should take into account the value of secondary pests as food for predators.

News and opinion

The collaborative role of research and extension

by Lowell N. Lewis

Peer-reviewed research and review articles

Grapevines show seasonal differences in susceptibility to eutypa

by Curtis H. Petzoldt, William J. Moller, Mary Ann Sall

Abstract

Early-winter pruning results in the highest probability of infection; March pruning, the least.

Chemical control of phomopsis grapevine cane and leaf spot disease

by Jim D. Cucuzza, Mary Ann Sall

Abstract

Dormant and properly timed foliar chemical treatments reduced severity of phomopsis disease in a two-year vineyard study.

Dormant or spring chemical applications controlled phomopsis

Vineyard cultural practices may help reduce botrytis bunch rot

by Steven D. Savage, Mary Ann Sall

Abstract

The two-wire trellis, midseason hedging, and a bloom-time fungicide spray each was associated with reduced bunch rot in vineyard tests.

Two-wire trellising and midseason hedging help minimize botrytis bunch rot, possibly by influencing the vine's microclimate.

Observations on Bodmin Nu-Pulse milking system

by Thomas A. Shultz, Richard N. Eide, Larry S. Collar

Abstract

The Bodmin self-adjusting vacuum pulsation unit performed satisfactorily, provided cleaning procedures were followed carefully.

Trunk injection corrects iron deficiency in plum trees

by Frank T. Yoshikawa, Wilbur O. Reil, Leslie K. Stromberg

Abstract

Injecting a ferrous sulfate solution into trunks of three-year-old plum trees corrected iron deficiency symptoms for two years.

Injections of ferrous sulfate appear to alleviate iron deficiency for about two years at a cost of 3 per tree.

Celery yields and uniformity are affected by pre-transplant practices

by Norman C. Welch, John W. Inman

Abstract

Eliminating weak and very vigorous celery plants before transplanting and keeping roots moist improved yield and uniformity.

Growers can select for easy-to-handle transplants without significantly reducing yield or increasing stalk size variation.

Two insects offer potential biological control of common purslane

by Stephen L. Clement, Robert F. Norris

Abstract

The purslane sawfly and portulaca leafmining weevil feed on the weed, apparently reducing its competitiveness and seed production.

They stress the weeds, reducing their vigor and seed production.

Mites: A primary food source for two predators in San Joaquin Valley cotton

by D. Gonzlez, Bonnie Ruth Patterson, Thomas F. Leigh, L. Theodore Wilson

Abstract

Cotton field trials suggest that economic thresholds should take into account the value of secondary pests as food for predators.