Chitinous Materials from Blue Crab for Control of Root-Knot Nematode II. Effect of Soybean Meal


  • R. Rodriguez-Kabana
  • D. Boube
  • R. W. Young


Biological Control, Callinectes sapidus, Chitin, Chitobiase, Clandosan 601, Invertase, Meloidogyne, M. arenaria, M. incognita, Organic Amendments, Phosphatase, Root-Knot Nematodes, Soil Enzymes, Urea, Urease


The efficacy of mixtures of soybean meal (SBM), urea and a chitinous material (Clandosan 601) derived from blue crab (Callinectes sapidus) wastes for control of Meloidogyne arenaria was studied under greenhouse conditions. Soil amendments containing 2-4 g SBM/kg of soil were most effective in reducing galls caused by M. arenaria in squash (Cucurbita pepo) roots when SBM was added to soil together with 1 g of Clandosan 601 and 0.5 g urea/kg of soil. These amendments stimulated microbial activity of soil as evidenced by increased soil enzymatic activities. Soil chitobiase activity increased with increasing rates of SBM added to soil and was related inversely to the number of galls/g of fresh squash root. Microplot studies demonstrated that a mixture containing by weight 50% SBM, 25% urea, and 25% Clandosan 601 when applied to soil at 8 t/ha was effective in suppressing M. incognita and increasing yield of 'Purple Hull' cowpea (Vigna unguiculata), 'Black Beauty' eggplant (Solanum melong