By Chelston W. D Brathwaite
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Additional resources for An Introduction to the Diagnosis of Plant Disease
The pathogen is sensitive to drying, and in citrus, the spread of the pathogen can be retarded by exposing the root crown and large roots to the air. In South Africa control has been achieved by removing the entire tree and larger roots followed by leaving the planting hole open for a period of 3-6 months, before replanting. The preferred method is soil fumigation with methyl bromide under soil conditions which allow free movement of the fumigant throughout the treated area (Faber and Ohr 1999, Manicom 2001, Ohr et al.
If Z>20 when fruit is in the susceptible phase the second application is replaced with benomyl. It has been found vital to apply the first spray before Z values exceed 20. Biological control with Bacillus spp. was found to be effective in field experiments in South Africa (Havenga et al. 1999, Manicom 2001). Effective fungicidal control is more difficult in late maturing cultivars such as Choquette, Lula and Monroe, and requires more frequent sprays (Pohronezny et al. 1998). 7 Verticillium wilt Verticillium wilt was first described in California in 1949.
1983. Dematophora root rot on avocado trees in Israel and the development of a diagnostic method. Phytoparasitica, 11:238-239. E. B. 1941. Avocado diseases in Florida. S. Dept. Agric. Circ. 582. A. 1949. Verticillium wilt of avocado. Phytopathology 39:677-682. A. 1951. Studies on blackstreak disease of avocado. In: Rep. Uni. Calif. Citrus Exp. Stn, Riverside. Proj. 191-192. A. 1980. Phytophthora cinnamomi and the Diseases It Causes. Monogr. 10. APS Press, St. Paul, Minnesota, USA. A. 1984. Avocado diseases.
An Introduction to the Diagnosis of Plant Disease by Chelston W. D Brathwaite