Entomology, Department of


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J. N. Seiber, E. A. Heinrichs, G. B. Aquino, S. L. Valencia, P. Andrade, A. M. Argente. 1978. Residues of carbofuran applied as a systemic insecticide in irrigated wetland rice: implications for insect control. IRRI Research Paper Series No. 17, May 1978, 28 pages.


The behavior of carbofuran residues in rice plants treated by broadcast, soil incorporation, and root-zone application,and by seedling root-soak and root-coat technique was studied. Placement of insecticide in gelatin capsules in the root zone gave good persistence (about 60 days) and leaf residue (as much as 45 ppm at 10 days after treatment). Among the methods tested it also controlled early season pests best and gave the highest grain yields. Soil incorporation and root-zone placement with a liquid-band applicator was also more efficient than paddy-water broadcast in getting insecticide to the plant; soil incorporation provided slightly longer persistence (60 days) and less insect damage. Soaking seedling roots in carbofuran solution just before transplanting (root soak) gave high residues at 10 days after treatment (DAT) but rapid dissipation and little residue by 20 DAT . Addition of gelatin or perlite sticker to the root-treatment medium, (root coat) extended the persistence of 0.2 to 1.0 ppm residues by about 10 days.

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