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Infectivity and Population Dynamics of the Rice Stem Nematode, Ditylenchus Angustus

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For more content, see Nematology.

Infectivity studies demonstrated that third (J3) and fourth stage juveniles (J4) and adults of Ditylenchus angustus were all able to infect rice seedlings in agar and pot cultures; second stage juveniles (J2) were infective in agar cultures but invaded only rarely in pot cultures. Over a four month period after inoculation of D. angustus into two week old rice seedlings, there was no marked variation in the percentage of stages from the original inoculum, with J4 accounting for 56 to 64% of the population. Few nematodes were found in the folded leaves of the rice plants. With increasing age of host plant, the nematodes were found in large numbers at the top of the stems and in the panicles and frequently accumulated on the seeds. It is probable that the J4 is the principal stage that survives between crop seasons and invades new hosts.

Affiliations: 1: Entomology and Nematology Department, AFRC IACR, Rothamsted Experimental Station, Harpenden, Herts, AL5 2JQ UK


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