Preliminary epidemiological study of powdery mildew (Oidium tingitaninum) on Citrus sinensis.
1992
Sastra Hidayat A.R.
Oidium tingitaninum causes powdery mildew on citrus which causes the shoots to collapse dry with a white colour. This paper reports the results of research on O. tingitaninum epidemiological aspects which has been done in the laboratory and in the field. The laboratory study was to understand the infection cycle and the influence of humidity, temperature, and light under controlled conditions on the conidial germination and development. A similar study on the conidial germination and development have also been done under field conditon. The interaction of these factors under natural conditions were also analyzed. The results showed that the disease has 4 days infection cycle; the optimal conidial germination and germ tube to grow was 20 degree-25 degree C and 70-80 percent relative humidity. It was shown that light stimulated these factors. Young leaves (0-3 weeks after emergence) were the most susceptible for infection; the epidemic trends occurred when the rainfall was low with an optimum temperature of 20 degree - 25 degree C. Conidia showed positive correlation to disease incidence with the equation : Y = -4.35 + 0.33 X.
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