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Seed-Applied Insecticides Inconsistently Affect Corn Forage in Continuous Corn
Western corn rootworm (Diabrotica virgifera virgifera Le Conte) is the major insect pest in the corn phase of a corn (Zea mays L.) silage-perennial forage rotation. Dairy producers may prefer seed-applied instead of soil-applied insecticides for rootworm control because of ease of use and additional...
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Published in: | Agronomy journal 2007-11, Vol.99 (6), p.1640-1644 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Western corn rootworm (Diabrotica virgifera virgifera Le Conte) is the major insect pest in the corn phase of a corn (Zea mays L.) silage-perennial forage rotation. Dairy producers may prefer seed-applied instead of soil-applied insecticides for rootworm control because of ease of use and additional control of some other soil insect pests. The objective of the 2-yr NY field study was to evaluate clothianidin [(E)1-(2-chloro-1,3-thiazol-5-ymethyl)-3-methyl-2 nitroguanidine] and thiamethoxam (3-[(2-chloro-5-thiazolyl)methyl]tetrahydro-5-methyl-N-nitro-4H-1,3,5-oxadiazin-4-imine) at the 1.25 mg a.i. kernel-1 rate for rootworm control, dry matter (DM) accumulation, DM yield, and silage quality. The control had moderately severe (1.40-node injury scale), whereas clothianidin (0.18) and thiamethoxam (0.39) had acceptable rootworm damage ratings. Clothianidin had greater DM accumulation at the 12th leaf stage (384 g m-2) compared with thiamethoxam and the control (324 g m-2), greater DM accumulation 3 wk after silking (1491 g m-2), and greater DM yield (18.5 Mg ha-1) compared with the control (1245 g m-2 and 17.0 Mg ha-1, respectively). Thiamethoxam had similar DM yield (17.4 Mg ha-1) but greater milk Mg-1 (1559 kg Mg-1) compared with clothianidin (1475 kg Mg-1). Clothianidin had greater calculated milk yield (27,301 Mg ha-1) compared with the control (25,411 Mg ha-1) but similar to thiamethoxam (27,192 Mg ha-1). Clothianidin and thiamethoxam provided acceptable rootworm control in this study but more research is required to determine if these results are consistent across different environments in the Northeast United States. |
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ISSN: | 0002-1962 1435-0645 |
DOI: | 10.2134/agronj2007.0104 |