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Planting cotton early may mean less stink bug damage

Planting cotton early may mean less stink bug damage
2014-03-19
(Press-News.org) Stink bugs have been consistently ranked among the most damaging insect pests of cotton in the southeastern United States for the past several years. Apart from the feeding damage, stink bugs are capable of transmitting cotton seed and boll-rotting bacteria such as Pantoea agglomerans.

In order to find out whether cultural practices could be used to manage stink bugs -- such as adjusting the date of planting to mitigate peak pest pressure -- researchers from the University of Georgia compared cotton plots that were planted in May to other plots that were planted in June.

The results, which are published in the Journal of Economic Entomology showed that the rate of boll damage generally increased more rapidly through the bloom cycle for planting dates in June compared with May.

"Our study implies that planting cotton early in the planting window will allow growers to escape peak stink bug pressure and thereby possibly eliminate or minimally reduce the number of sprays required to manage them," the authors wrote.

In 2011, mean lint yield and economic returns from May planting dates were significantly greater than June planting dates, and in 2012, lint yield and economic returns were greater in plots established in early May compared with later planting dates.

Lint yield was reduced up to 36% in 2011 in late June-planted cotton when compared with lint yield of early May-planted cotton.

The authors suggest that there are two explanations for decreased boll damage in early planted cotton. First, the earliest planted cotton started blooming in early July when there would be many other suitable stink bug hosts, both agronomic and wild, in the farmscape. Conversely, the June-planted cotton did not start blooming until mid-August when some wild hosts and agronomic hosts like corn would dry to the point of no longer being attractive to stink bugs. Thus, blooming cotton may attract a larger percentage of the stink bug population during August and September.

Second, southern green stink bugs are multivoltine and there would be time for an additional generation to develop by the time the June-planted cotton was most attractive.

INFORMATION: The full article is available at http://dx.doi.org/10.1603/EC13395.

The Journal of Economic Entomology is published by the Entomological Society of America, the largest organization in the world serving the professional and scientific needs of entomologists and people in related disciplines. Founded in 1889, ESA today has more than 6,500 members affiliated with educational institutions, health agencies, private industry, and government. Members are researchers, teachers, extension service personnel, administrators, marketing representatives, research technicians, consultants, students, and hobbyists. For more information, visit http://www.entsoc.org.

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Planting cotton early may mean less stink bug damage

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[Press-News.org] Planting cotton early may mean less stink bug damage