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CropMonitor > Winter Wheat > National Surveys  


2005/2006 SURVEY: SUMMER APHID ASSESSMENT 2006
Unsprayed crops at growth stage 61-70
 
Site Location Number of sites Grain aphid per head per site Rose-grain aphid per tiller per site
North 8 0.24 0.28
Lincs 6 0.26 0.16
Midlands 6 0.70 0.81
East 6 0.18 1.68
South 7 0.03 0.35
mean of all 33 sites 0.27 0.62
 
Unsprayed crops at growth stage 71+
 
Site Location Number of sites Grain aphid per head per site Rose-grain aphid per tiller per site
North 8 0.24 0.28
Lincs 6 0.26 0.16
Midlands 6 0.70 0.81
East 6 0.18 1.68
South 7 0.03 0.35
mean of all 33 sites 0.35 0.33
 
Thresholds
Published thresholds are 5 per head for grain aphid and 5 per tiller for rose-grain aphid

Number of sites with more than 5 grain aphid per head:0 (0%)
Number of sites with more than 5 rose-grain aphid per tiller:0 (0%)

 
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This website was last updated on: 12/05/2008     © Crown Copyright Central Science Laboratory 2007
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All risk predictions published by CropMonitor are provided in good faith and are NOT a substitute for rigorous fieldwalking in combination with advice from BASIS qualified persons. CropMonitor accepts no liability for crop loss or damage resulting from the use of CropMonitor.