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Insecticide treatments in combination with herbicides cause crop injury and yield loss
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Insecticide treatments in combination with herbicides cause crop injury and yield loss
Keyword:
Publish time:
31
st
March, 2015
Source:
USA
Information collection and data processing: CCM For more information, please
contact us
Insecticide treatments in combination with herbicides cause crop injury and yield lossInsecticide treatments in combination with herbicides cause crop injury and yield loss" title="Share this link on Facebook">USAMarch 31, 2015As growers across the southern United States have planted increased
corn
acreage in recent years, corn-attacking insects have become a widespread problem, including populations of the western corn rootworm that have developed resistance to insecticidal proteins produced by genetically modified Bt corn varieties. Foliar sprays are ineffective because this rootworm, and other insects such as the
sugarcane
beetle, attack corn seedlings below ground. To combat such pests, at planting growers apply in-furrow granular or liquid insecticides such as the organophosphate chlorpyrifos. However, some Tennessee corn growers report reduced
grain
yields from crop injury when fields are treated with both an organophosphate
insecticide
and an
herbicide
premix.A new study published in the journal Weed Technology investigated effects on crop health of combining insecticide and herbicide treatments. For two years, field experiments were conducted in western Tennessee to examine plant injury and yield loss in corn resulting from different combinations of in-furrow and foliar applications of chlorpyrifos with either a mesotrione- or tembotrione-based herbicide premix.Combining chlorpyrifos with a mesotrione-based herbicide premix produced low levels of plant injury and no yield loss. However, foliar application of chlorpyrifos combined with application of the tembotrione premix resulted in 29% injury to corn plants and 41% yield loss compared with corn that received only the herbicide treatment. Plant injury doubled to 56% and yield loss increased to 49% when chlorpyrifos was applied both in-furrow at planting and as a foliar spray.This study shows that some of the newer herbicide premixes combined with organophosphate insecticides can cause severe crop injury, and that growers need to pay careful attention to which herbicides are applied when using organophosphate insecticides for insect management.Full text of the article, “Corn Response to POST-Applied HPPD-Inhibitor Based Premix Herbicides with In-Furrow and Foliar-Applied Insecticides,” Weed Technology, Vol. 29, No. 1, January–March 2015, is now available.About Weed TechnologyWeed Technology presents (1) original research on weed/crop management systems, herbicides, weed resistance to herbicides, and weed biology; (2) reports of new weed problems, weed-related surveys, and newMore news from: Weed Science Society of America (WSSA)Website: http://www.cnchemicals.com/: March 31, 2015The news item on this page is copyright by the organization where it originatedFair use notice
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