01864nas a2200145 4500008004100000245012800041210006900169300001400238490000700252520135900259100001201618700001401630700001701644856005701661 2009 eng d00aEffectiveness of aluminum-fosetyl in the control of early nutfall of coconut tree due to Phytophthora katsurae (Pythiaceae)0 aEffectiveness of aluminumfosetyl in the control of early nutfall a123–1330 v153 a

Early nut fall and bud rot due to Phytophthora katsurae are the most important diseases of coconut tree observed in recent years at the Assinie plantations of PALMINDUSTRIE Company, Côte d’Ivoire. Field investigations conducted in 1983 revealed a high rate of nut fall (50-70%) during the rainy season. Cutting of coconut stands with rotten buds, as a way to control the spread of Oryctes sp., allowed to assess the number of dead trees over 139 and 89 ha of land for the hybrids and Grand West cultivars, respectively. In addition to those disease control measures proposed by the Company, comparison trials were systematically carried out using 2 fungicides: aluminum-fosetyl [fosetyl] at 3 doses (3.2, 4.8 and 6.4 g of active ingredient/tree) and Ridomil [metalaxyl] at one dose (3.125 g of active ingredient/tree). These fungicide were injected into the stem of the coconut every 3 months starting from December 1984. After 3 years, the efficacy of the 3 doses of aluminium-fosetyl over Ridomil in significantly reducing nut fall, even at low rates (3.2 g of active ingredient/tree), was apparent. However, the technique still remains out of reach of most farmers because of lack of technical know-how. It appears therefore, that an improvement of the technique, so as to make it accessible to the farmers, is a necessity.

1 aPohe, J1 aDongo, BK1 aN’Goran, N uhttp://www.ajol.info/index.php/aga/article/view/163300932nas a2200121 4500008004100000245011700041210006900158300001200227490001600239520040700255100001200662856013600674 1999 eng d00aFactors involved in the development of nutfall [Cocos nucifera nuts] due to Phytophthora katsurae in Ivory Coast0 aFactors involved in the development of nutfall Cocos nucifera nu a150-1530 v16/17 No. 33 aNut rot on coconut can be spread simply by contact or by spreading agents which maintain isolated infections within a bunch on a given tree and at plot level. The disease generally spreads horizontally from one bunch to another and vertically, particularly vertically downwards, from one nut to another in a given bunch. The positive effect of water and insects in disease spread has been demonstrated.1 aPohe, J uhttps://forestphytophthoras.org/references/factors-involved-development-nutfall-cocos-nucifera-nuts-due-phytophthora-katsurae-ivory