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IPM Survey Insect Update (06/22/17)

IPM Survey Insect Update

IPM Survey Insect Update

Wheat:  Cereal aphids were present in 10% of the wheat fields surveyed by the IPM scouts in North Dakota. Aphid population levels continue to be low and ranged from 0% to 36% of stems with at least one aphid present. The cool, wet weather last week was not favorable for aphid reproduction. However, the wheat crop is growing fast and will probably outpace the risk from cereal aphids. Wheat fields surveyed showed that most of the wheat crop is in the jointing to boot crop stages. Remember, the greatest risk of yield loss from aphids feeding on grains is in the vegetative to boot stages. After the onset of flowering, significant yield losses do not occur from aphid feeding injury.

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Wheat:  Wheat stem sawfly is emerging as one field site collected an adult while sampling with a sweep net in Golden Valley County.

 

Grasshoppers also continue to be low and were observed in 31% of the fields surveyed by the IPM Scouts throughout North Dakota. Sweeping for grasshopper nymphs ranged from 0-8 nymphs per 4 sweeps. In field ditches, an action threshold is 50-75 nymphs per 4 sweeps (equivalent of one square yard). Again, cool, wet weather is not favorable for grasshopper development.

 

Soybean:  No soybean aphids were found in North Dakota last week. Severe thunderstorm that moved through eastern North Dakota are probably to thank since these storms can wash aphids off plants, especially when soybeans do not have a good canopy yet. Higher numbers of soybean aphids are being reported in Minnesota and South Dakota, especially near river bottoms with buckthorn (overwintering host of soybean aphids). Continue to scout for soybean aphids.

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Janet J. Knodel

Extension Entomologist

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