Aphelenchoides besseyi in irrigated upland and lowland rice during dry and wet seasons.
1994
Huelma C.C. | Prot J.C. | Merca S.D. | Mew T.W.
Aphelenchoides besseyi, the causal agent of white-tip disease, is the only seedborne rice parasitic nematode. It was detected on both irrigated lowland and upland rice in both seasons. Frequency of A. besseyi occurrence during WS on the upland and irrigated lowland farms was similar. Except for the upland rice farm where the nematode was not detected during 1989 DS, the average number of A. besseyi per sample under either condition and under either season was not significantly different when compared using ANOV. A. besseyi, however, appears to be less frequent on the upland rice farm during the DS crop than on the irrigated farm during DS and WS crops and on the upland farm during WS. The nematode needs high canopy humidity to infest the aerial part of the plant, a condition present in irrigated lowland with standing water. Multiplying seeds for international exchange under upland conditions during DS may reduce the risk of A. besseyi contamination. Using gravity flow irrigation instead of sprinkler irrigation may further reduce the occurrence of A. besseyi under upland conditions during DS.
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