Nematology Research Centre, Faculty of Agriculture, Cairo University, Giza, Egypt.
* Present address: Nihort, P.N.B. 5432, Ibadan, Nigeria.
Hatchability in Meloidogyne javanica was reduced and infectivity and development of the juveniles was considerably retarded by several organic and inorganic amendments. Sheep dung and rice straw were most effective, pigeon droppings and horse dung were intermediate and poultry droppings were the least effective. No emergence of juveniles occurred in 10 g urea or ammonium nitrate per litre but emergence was low in ammonium sulphate. Hatching increased after removal of egg masses from the toxic solutions into water, though pretreatment with sheep dung, rice straw, pigeon droppings and urea remained significantly inhibitory at the higher concentrations. Second stage Juveniles when treated with inorganic amendments were more seriously affected than those treated with the orsanic substances. Subsequent to transfa of egg masses to fresh water, test materials had no effect on infectivity, except for sheep dung, rice straw, pigeon droppings and urea which had irreversible effects.
