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West Texas A&M University (2015)

Population Dynamics of Wheat Curl Mite with Deficit Irrigation and Cultivar Mixtures

Simmons, Angela R

Titre : Population Dynamics of Wheat Curl Mite with Deficit Irrigation and Cultivar Mixtures

Auteur : Simmons, Angela R

Université de soutenance : West Texas A&M University

Grade : Master of Agriculture 2015

Résumé partiel
Wheat streak mosaic virus (WSMV), vectored by the wheat curl mite, Aceria tosichella Keifer, (WCM) is one of the major limiting factors in production of wheat (Triticum aestivum L.) in the Great Plains region of the United States. In addition to its direct effect on yield, the virus significantly reduces water-use efficiency, which is of concern in semi-arid regions such as the Texas Panhandle where irrigation water is limited. Severity of wheat streak has been observed to increase during years of severe drought, possibly because of greater abundance of mites. Other mite species also have been reported to increase in numbers on drought-stressed plants. In the Texas Panhandle, much of the wheat crop is irrigated, but because of depletion of the water in the Ogallala Aquifer, less than the full amount of water required for production of crops often is applied. Over time wheat lines have been bred to tolerate drought conditions in areas with scarce rainfall. However, little is known of the optimal reproductive capability of wheat curl mite under deficit irrigation in a wheat field and its impact related to disease severity. Therefore, field studies were done using two wheat cultivars, Karl 92 (susceptible) and TAM 112 (tolerant), at three amounts of irrigation (33, 67, and 100% of potential evapotranspiration rate) at the Texas A&M AgriLife Research Station, at Bushland, TX, in 2013 and 2014. Numbers of mites, severity of disease and soil moisture content were evaluated for each cultivar and amount of irrigation water applied. Overall, mite numbers increased as irrigation amounts decreased (R² = 0.5077, P = 0.0009). Also, there was a slight but significant positive correlation between severity of disease and soil moisture (R² = 0.3307, P = 0.0125). Studies in a greenhouse assessed abundance of wheat curl mite and incidence of wheat streak mosaic. More wheat curl mites were found in the 33 and 67% water-replacement treatments for the TAM 112 cultivar.

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