Arizona Russian Wheat Aphid Survey and Beneficial Release Report, 1990
Issue Date
1991-09Keywords
Agriculture -- ArizonaGrain -- Arizona
Forage plants -- Arizona
Barley -- Arizona
Durum -- Arizona
Wheat -- Arizona
Barley -- Russian wheat aphid
Durum -- Russian wheat aphid
Wheat -- Russian wheat aphid
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During 1990 the emphasis on surveying was placed in the southeastern corner of the state, where damage was found to be most severe in previous years. Estimates of the incidence of and damage caused by the Russian Wheat Aphid (RWA) were made for the entire state. These estimates indicate that small grain producers in the state lost $212,000 due to this pest in 1990.Series/Report no.
370090Series P-90
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Russian Wheat Aphid Survey in Southeastern Arizona, 1990(College of Agriculture, University of Arizona (Tucson, AZ), 1991-09)Fifteen small grain fields, including eight wheat fields, two barley fields and five oat fields, throughout the grain growing areas of Graham, Greenlee and Cochise counties were surveyed weekly from the third week in March through the second week in June, to document the presence of Russian wheat aphid (RWA), other aphid, parasites and predators. RWA were found in all three counties and in all three grains. Presence of RWA caused chemical pest control applications in approximately 19%, 33% and 90% of the small grain fields in Graham, Greenlee and Cochise counties, respectively. Thirty three percent of the fields had beneficial parasites and predators were found 93% of the fields. Presence of parasites reduced the RWA populations in 80% of the cases and presence of predators had a dramatic effect on other aphids and was felt to be beneficial in controlling RWA.
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Intensive Cereal Management for Durum Production, Buckeye, 1996(College of Agriculture, University of Arizona (Tucson, AZ), 1996-10)
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Influence of Nitrogen Fertilizer Applied at Flowering on Durum Wheat Grain Yield and Quality(College of Agriculture, University of Arizona (Tucson, AZ), 1996-10)Application of nitrogen (N) fertilizer in conjunction with the irrigation event occurring closest to the flowering stage is effective in reducing the incidence of yellowberry and boosting grain protein levels of durum wheat. However, N applications at this time normally do not increase grain yield, except perhaps on very sandy soils. A field experiment was conducted to determine the profitability of applying 35 pounds of N per acre at flowering to durum wheat to avoid dockage for poor grain quality. Two treatments consisted of a check plot with no N applied at flowering and UAN 32 water run at a rate of 35 lbs. N /acre to basin irrigated durum wheat grown on a loamy sand soil. Maximum durum wheat grain yield (6157 lbs. /acre), protein concentration (13.7 %), and corrected income per acre ($480.31) was obtained with the N fertilizer application. In fact, N fertilization at flowering on this sandy soil increased durum wheat grain yield by 255 lbs. /acre compared to the unfertilized plot.
