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A bait and trap method for sampling symphylid populations in pineapple

Marie Alphonsine P.A., Fournier P., Dole B., Govindin J.C., Soler A.. 2010. Pineapple News (17) : p. 18-22. International Pineapple Symposium. 7, 2010-07-13/2010-07-15, Johor Bahru (Malaisie).

Symphylids (Hanseniella sp) are polyphagous soil-borne parasites. On pineapple, they feed on roots tips (meristem tissues) producing either short roots with irregular swelling or roots with multiple branching resulting in the typical " witches brooms ", (Kéhé, 1988; Py et al.1984; Petty et al., 2002). This behavior alters the root efficiency. The reddish plants look wilted with poor anchorage and growth. At field level, the crop appears as an irregular patchwork of diseased and normal plants, similar in appearance to nematode-induced symptoms (Py et al.1984; Kéhé, 1995; Soler, 1998; Perrier et al., 1993). Actually, diagnosing this disease in pineapple fields is rendered difficult due to possible confusion with other problems as water or nutrient deficiencies, nematodes, wilt (Kéhé, 1988; Py et al.1984). As a consequence of the reduction in the use of pesticides due to environmental concerns, the control of symphylid populations in pineapple now requires particular and novel attention by researchers looking for an alternative to the chemical control of symphylid populations. Symphylids can be trapped and counted using appropriate bait or soil samples (Umble and Fischer, 2003a and Umble et al., 2006). We developed a reliable method to monitor symphylids in pineapple that combines bait and soil sample.

Mots-clés : ananas comosus; mucuna pruriens; symphyla; réunion; france; hanseniella

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