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Emergency post planting applications of insecticides to control larvae of the western corn rootworm and northern corn rootworm in nebraska usa


Emergency post planting applications of insecticides to control larvae of the western corn rootworm and northern corn rootworm in nebraska usa



Journal of Economic Entomology 69(5): 600-602



ISSN/ISBN: 0022-0493

Emergency postplanting applications on June 25, 1975, of granular and liquid formulations of carbofuran, diazinon and fensulfothion and liquid Dyfonate (O-ethyl S-phenyl ethylphos-phonodithioate) applied to irrigated and dryland plots [corn] already severely damaged by larvae of western corn rootworm, Diabrotica virgifera LeConte, and northern corn rootworm, D. longicornis (Say) (root damage rating = 3.95), did not provide control comparable to a carbofuran 10G treatment applied at planting time (application rate = 1.2 oz AI[active ingredient]/1000 ft of row). Application of each liquid insecticide in either 16 or 32 gal of water/acre had no significant (P = 0.05) effect on the control provided by carbofuran and fensulfothion treatments, but the 32 gal rate of diazinon and the 16 gal rate of Dyfonate under dryland conditions resulted in significantly (P = 0.05) greater root protection than their alternate rates. A significant (P = 0.05) insecticide treatment by irrigation-dryland interaction was detected for root damage ratings adjusted for regrowth with more root damage ratings adjusted for regrowth with more root regrowth occurring in the irrigated area. Results indicate that emergency treatments after 1 node of roots has been destroyed by rootworms may be economically beneficial, but major damage already has occurred.

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Accession: 005354231

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Related references

Emergency Postplanting Applications of Insecticides to Control Larvae of the Western and Northern Corn Rootworm in Nebraska. Journal of Economic Entomology 69(5): 600-602, 1976

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