Distribution and disease mapping of stem bleeding disease of coconut (Cocos nucifera L.) in the Philippines
1998
Bachiller, N.C.S.J. | Abad, R.G. (Philippine Coconut Authority, Bago-Oshiro, Davao City (Philippines). Crop Protection Div.)
Records of disease occurrence in surveyed provinces show Davao del Sur [Philippines] having the highest disease incidence of stem bleeding caused by Thielaviopsis paradoxa (de Seynes) von Hohnel. Disease incidence in Malayan Yellow Dwarf x West Africa Tall (MY x WAT) hybrid at the PCA [Philippine Coconut Authority], Zamboanga Research Center was relatively lower than the other areas observed. Tall genotypes are less susceptible to the disease as shown in the province of Quezon where the cultivar Laguna Tall is predominantly grown. The incidence of stem bleeding 1 was found to be related to palms age. More incidence of the disease was noted in palms between 11-15 years old. Study on the spatial distribution of the disease from 1991 to 1995 shows that the disease initially occurred in random foci. From a focus, the disease infected adjacent palms. The disease progress curves suggest that stem bleeding follow, a sigmoid curve, where the progress of the disease at any given time is a function of the initial inoculum and the number of effective contact points between susceptible host and inoculum per unit time. Analysis of the infection rates using logistic growth model showed that the rate of disease increase ranged from 0.029 to 0.218 per unit per year and 0.227 per unit per year in all the six experimental areas. Increase in disease incidence is directly related with the occurrence of a high amount of rainfall
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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