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Control of aphids on barley • economic treatment levels • analysis of yield increases

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Authors

Vernon M. Stern , University of California
William R. Bowen, Agricultural Extension Service

Publication Information

California Agriculture 21(3):14-15.

Published March 01, 1967

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Abstract

Very good control of aphids in barley was obtained with commercial-scale airplane applications as low as 5 Ibs of 10% Thimet granules (1/2 Ib actual toxicant) per acre. However, problems with hopper calibration, and the extreme accuracy in flying necessary to apply this low rate of the systemic insecticide, make a 71/2- to 10-lb rate of application more realistic. Chemical control of aphids on barley was found economical only when populations averaged significantly higher than 25 to 30 aphids per tiller. In seven southern California barley fields treated with Thimet granules (at 1 Ib of actual material per acre) the mean yield increase was 434 ± 128 Ibs per acre. Even at the lowest increase (306 Ibs per acre) the value of the extra yield was well above the cost of aphid control. The average aphid population in the check plots rose to 39 per tiller.

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Control of aphids on barley • economic treatment levels • analysis of yield increases

Vernon M. Stern, William R. Bowen
Webmaster Email: wsuckow@ucanr.edu

Control of aphids on barley • economic treatment levels • analysis of yield increases

Share using any of the popular social networks Share by sending an email Print article
Share using any of the popular social networks Share by sending an email Print article

Authors

Vernon M. Stern , University of California
William R. Bowen, Agricultural Extension Service

Publication Information

California Agriculture 21(3):14-15.

Published March 01, 1967

PDF  |  Citation  |  Permissions

Author Affiliations show

Abstract

Very good control of aphids in barley was obtained with commercial-scale airplane applications as low as 5 Ibs of 10% Thimet granules (1/2 Ib actual toxicant) per acre. However, problems with hopper calibration, and the extreme accuracy in flying necessary to apply this low rate of the systemic insecticide, make a 71/2- to 10-lb rate of application more realistic. Chemical control of aphids on barley was found economical only when populations averaged significantly higher than 25 to 30 aphids per tiller. In seven southern California barley fields treated with Thimet granules (at 1 Ib of actual material per acre) the mean yield increase was 434 ± 128 Ibs per acre. Even at the lowest increase (306 Ibs per acre) the value of the extra yield was well above the cost of aphid control. The average aphid population in the check plots rose to 39 per tiller.

Full text

Full text is available in PDF.

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