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The Effect of Diflubenzuron on Egg Formation by the Root-Knot Nematode

Journal of Nematology
Publication Date
  • Chemistry


The Effect of Diflubenzuron on Egg Formation by the Root-Knot Nematode RESEARCH HOTES The Effect of Diflubenzuron on Egg Formation by the Root-Knot Nematode 1 JOSEPH A. VEECH 2 I recently reported that diflubenzuron (N-[ (4-chlorophenyl) amino]-carbonyl-2, 6-di- fluorobenzamide) (Dimilin; Thompson- Hayward Chemical Co., P. O. Box 2383, Kansas City, Kansas 66110), an insecticide that inhibits chitin synthetase (E.C. activity (1), has nematicidal activity also (2, 3). The nematicidal activity was peculiar because the chemical was not toxic to larvae but apparently reduced the fecundity of treated adults. Alter exposure to a dietary supplement of 10 ppm diflubenzuron for 10 days a population of PeIodera sp. was only 5% the size of untreated control (3). Similarly, cotton (Gossypium hirsutum L.) roots treated with the chemical had fewer root-knot nematode (Meloidogyne incog- nita Kofoid & White, Chitwood) egg masses/root system than did untreated controls (3 and 18 egg masses/root system) (2). Reports on diflubenzuron effects on M. incognita mentioned only the effect on numbers of egg masses. It is possible, al- though unlikely, that three egg masses could contain as many eggs as 18 egg masses. This note therefore reports the effect of diflubenzuron on the number of M. incog- nita egg masses and eggs recovered/g cotton roots 28 and 72 days after planting. The materials and methods, reported briefly here, were as reported earlier (2) except that the egg mass and egg counts were based on the fresh weight of the roots, and the egg masses were stained with 0.1% phloxine-B in H20 to facilitate counting. Cotton plants (Deltapine 16) were exposed to diflubenzuron as either a seed, soil, or seed-and-soil treatment. As a seed treat- ment, the chemical was infused into the seed with an organic solvent (dimethyl sulfoxide). As a soil treatment, the chem- Received for publ icat ion 7 September 1977. 1This paper reports the results of resear

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