Standardized visual comparison keys for rapid estimations of citrus rust mite (Acari: Eriophyidae) populations
1994
Rogers, J.S. | McCoy, C.W. | Manners, M.M.
Standardized visual comparison keys were effective in improving accuracy and precision in rapid field estimations of citrus rust mite, Phyllocoptruta oleivora (Ashmead), population densities. A standardized key based on the Horsfall-Barratt system for the measurement of plant disease is presented. Errors in mean population estimations were generally < 10% using this key when either leaves or fruits were sampled. Effective use of this technique depends on the ability of scouts to adopt a system of grouping instead of counting rust mites. Accurate and precise population measurements are independent of environmental and genetic factors; thus this technique is applicable to leaf or fruit tissue in any geographical location. Use of the modified Horsfall-Barratt system for estimating citrus rust mite populations in an integrated crop management program is described.
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