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lnsrirut Francais de Recherches FruitGres Ourre Mer (I. F.A. CJ, B. P. 1740 Abidjan, Ivory Coast.Summary. Pineapple growing i s very important in the economy of many tropical countries, but nematodes are a very serious problem in this crop. Among the many phytophagous species found in the root zone of pineapples, Meloidogyne spp., Prarylenchus spp. and Rotylenchulus reniformis (Linford and Oliveira) are particularly important.In fact, these species can reduce the yields by more than 40% for the first crop and sometimes they can obviate all possibility of harvesting a second crop without replanting. These pests are very polyphagous and can ako survive for many months in the absence of host-plants and thus, non-chemical control measures are of limited interest, though a few interesting local results have been obtained.Some of these methods are, nevertheless, an appreciable addition t o the application of nematicides. Fumigant nematicides, such as dichloropropane -dichloropropene mixture, ethylene dibromide and dibromochloropropane are presently used with success in some countries, but their use is far from general.Some new, more effective but more expensive, nematicides are being tested but their use will vary according to the economic conditions in each country. With these new compounds the crops can be kept free of nematodes and, on non-organic soils, the efficiency and the real profitability of usual pest control methods can now be assessed.In this report, the author tries to summarise the acquired knowledge on the damage by nematodes to pineapple crops and to estimate the methods used to limit the losses. Reports are, however, lacking in many cases or are limited to a list of existing nematodes. PANS 21: [123][124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140] 1975.
lnsrirut Francais de Recherches FruitGres Ourre Mer (I. F.A. CJ, B. P. 1740 Abidjan, Ivory Coast.Summary. Pineapple growing i s very important in the economy of many tropical countries, but nematodes are a very serious problem in this crop. Among the many phytophagous species found in the root zone of pineapples, Meloidogyne spp., Prarylenchus spp. and Rotylenchulus reniformis (Linford and Oliveira) are particularly important.In fact, these species can reduce the yields by more than 40% for the first crop and sometimes they can obviate all possibility of harvesting a second crop without replanting. These pests are very polyphagous and can ako survive for many months in the absence of host-plants and thus, non-chemical control measures are of limited interest, though a few interesting local results have been obtained.Some of these methods are, nevertheless, an appreciable addition t o the application of nematicides. Fumigant nematicides, such as dichloropropane -dichloropropene mixture, ethylene dibromide and dibromochloropropane are presently used with success in some countries, but their use is far from general.Some new, more effective but more expensive, nematicides are being tested but their use will vary according to the economic conditions in each country. With these new compounds the crops can be kept free of nematodes and, on non-organic soils, the efficiency and the real profitability of usual pest control methods can now be assessed.In this report, the author tries to summarise the acquired knowledge on the damage by nematodes to pineapple crops and to estimate the methods used to limit the losses. Reports are, however, lacking in many cases or are limited to a list of existing nematodes. PANS 21: [123][124][125][126][127][128][129][130][131][132][133][134][135][136][137][138][139][140] 1975.
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