Developmental patterns and yields of wheat (Triticum Asetivum L.) grown with minimal water
AuthorSarmadnia, Gholam Hossein
MetadataShow full item record
PublisherThe University of Arizona.
RightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Degree ProgramPlant Science
Degree GrantorUniversity of Arizona
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Russian Wheat Aphid Survey in Southeastern Arizona, 1990Clark, Lee J.; Ottman, Michael (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.
Arizona Russian Wheat Aphid Survey and Beneficial Release Report, 1990Clark, Lee J.; Moore, Leon; Ottman, Michael (College of Agriculture, University of Arizona (Tucson, AZ), 1991-09)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.