Influence of the environment on development and sex differentiation of root-knot nematodes

Abstract

Maleic hydrazide (MH) sprayed on tomato or tobacco seedlings infected by Meloidogyne incognita or M. javanica reduced the rate of development and affected the direction of sexual differentiation of the nematode larvae. The highest male percentage was obtained when plants were sprayed immediately after inoculation. The most effective dose of MH-30 was 12 mg/plant. Nematode larvae freely entered the plant roots during the first 24 hours following MH application. Fewer nematodes invaded the roots during the second and third day following application and invasion was later inhibited completely. Immersion of larvae in a 10% solution of MH-30 for various periods of time did not affect the rate of development or sex differentiation of the larvae. Female intersexes of M. javanica were obtained for the first time from plants treated with high rates of MH. They probably developed from advanced second stage female larvae through incomplete sex reversal. © 1968 BRILL.

Source or Periodical Title

Nematologica

ISSN

282596

Page

37-46

Document Type

Article

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