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Impact of 2,4‐D on Ceuthorhynchidius horridus (Coleoptera: Curculionidae) and their compatibility for integrated control of Carduus thistles
Author(s) -
TRUMBLE J. T.,
KOK L. T.
Publication year - 1980
Publication title -
weed research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.693
H-Index - 74
eISSN - 1365-3180
pISSN - 0043-1737
DOI - 10.1111/j.1365-3180.1980.tb00046.x
Subject(s) - thistle , weevil , biology , curculionidae , biological pest control , toxicology , horticulture , zoology , agronomy , botany
Summary: Acute and chronic effects of spring application of 2,4‐D on adult C. horridus (Panzer) were examined by determining dose‐mortality response and adult vitality. LC 50 values for males (70.2 kg/ha) and females (61.4 kg/ha) corresponded to 41.7 and 36.6 times, respectively, the recommended application rate of 1.68 kg/ha. Survival of weevils treated with 1.68 kg/ha was not different from untreated controls, but higher doses (16.8–147.8 kg/ha) caused significantly greater mortality. Adult vitality, measured by number of feeding marks per weevil and rate of weight change. was unaffected by the herbicide. When thistle infested fields were sprayed with 1.68 or 2.24 kg/ha of 2,4‐D the host plants died, but the survival, reproduction, and population increase of C. horridus were not affected.