The biological control agent is a small, stingless wasp called Aphelinus hordei that can be used to reduce the severity of damage caused by Russian wheat aphids. Scout fields by randomly selecting tillers along a random path and examining them for the presence of live aphids and symptoms of Russian wheat aphid damage. Populations have been higher in crops around Kimba, Kelly and Buckleboo that were not seed-treated. The Russian wheat aphid is a new pest in the U.S., having been first reported in 1986 near Muleshoe, Texas. August 2016. Russian wheat aphids reproduce constantly throughout the growing year, and instead of laying eggs like many insects, they give birth to live young. The decision was made by the National Management Group on Russian wheat aphid (RWA) based on advice from the Consultative Committee on Emergency Plant Pests. Five biotypes have been recorded here. Insecticides can reduce the chance of an aphid infestation. Cereal crops are most susceptible to a yield impact from RWA feeding from early booting to soft dough. The aphid itself is generally pale green in colour, adults are usually around 2mm long and have 2 tiny tails at the rear end of their body – a distinct difference between the RWA and other cereal aphids. Updated May 4, 2006 by Gary Hein and John Thomas General Thresholds for … Instead, they plant oats or an oat/wheat/barley mix. NOKULUNGA MZIMELA and DR JUSTIN HATTING, ARC-Small Grain, Bethlehem. The South American cassava mealybug ( Phenacoccus manihoti ) has invaded most cassava-growing regions of Africa and causes yield losses of up to 84% ( Norgaard, 1988 ). The best management strategy in areas where Russian wheat aphid is a problem is early planting, avoiding water stress, and isolation from riparian or permanent pasture. Russian wheat aphid. • … They will vary in color from green to blue to yellow. Aphid feeding prevents young leaves from unrolling. This tiny, green bug—about the size of a sesame seed—was first spotted in this hemisphere during the early 1980s, in Mexico. This not only makes it difficult to achieve good insecticide coverage, but also interferes with the ability of predaceous insects to reach and attack aphids. However, lady beetles such as Coccinella and Hippodamia are too large to enter the rolled leaves in which Russian wheat aphids are found. Treatment guidelines are given below (Table XII-2). The Russian wheat aphid is the most significant U. S. pest of wheat and barley production, and caused damage worth ~ $850 million from 1986-93. Aphids can be very difficult to Yield losses of up to 80% in wheat and 100% in barley have been reported overseas. If one tiller shows damage, then the plant should be considered damaged. Studies to identify molecular markers to facilitate resistance breeding started in the 1990s, and still continue. Evaluation of susceptibility to Russian wheat aphid, Diuraphis noxia (Homoptera: Aphididae) in several wheat cultivars at stem elongation growth stage. Warriewood NSW 2102 • … Keep an eye open for beneficials that can be present. In addition to assessing RWA densities, we recommend taking the following factors into consideration: (i) Crop stage and the time left until soft dough stage. Russian wheat aphid (Diuraphis noxia) is a major field pest of wheat and barley in many grain producing countries. This includes the cost of insecticide, application (diesel, machinery), and up to 2% additional crop losses incurred from knocking over grain while driving through the crop. Heavy infestations may kill plants.Russian wheat aphid can spread by wind, movement of machinery and vehicles, and on people’s clothing. Consequently, materials with systemic activity are superior for Russian wheat aphid control. 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