​​>>> Archive of 2017 Aphid numbers

​​​​​​​​​​​Winterton

T​his data shows aphid numbers up to week 28.​​ Trap samples are collected at the beginning of the week and are then sent to a laboratory where the aphids are sorted, identified and counted.  All aphids shown in these graphs are able to transmit Barley Yellow Dwarf Virus. The sensitive period for the wheat crop in Winterton is indicated by the red line on the x axis of each graph which is shown in weeks.  Aphid numbers above 100 could indicate possible problems for the specific area.  


 

Brits

T​his data shows aphid numbers up to week 28. Trap samples are collected at the beginning of the week and are then sent to a laboratory where the aphids are sorted, identified and counted.  All aphids shown in these graphs are able to transmit Barley Yellow Dwarf Virus. The sensitive period for the wheat crop in Brits is indicated by the red line on the x axis of each graph which is shown in weeks.  Aphid numbers above 100 could indicate possible problems for the specific area. 


 

Groblersdal

T​his data shows aphid numbers up to week 28. Trap samples are collected at the beginning of the week and are then sent to a laboratory where the aphids are sorted, identified and counted.  All aphids shown in these graphs are able to transmit Barley Yellow Dwarf Virus. The sensitive period for the wheat crop in Groblersdal is indicated by the red line on the x axis of each graph which is shown in weeks.  Aphid numbers above 100 could indicate possible problems for the specific area. 

Cookhouse

T​his data shows aphid numbers up to week 28.​​   Trap samples are collected at the beginning of the week and are then sent to a laboratory where the aphids are sorted, identified and counted. ​Problems were encountered with sample collection in weeks where red and black blocks appear on the line, these data are best estimates based on calculations from continuous sampling and may not reflect actual weekly aphid numbers.  Trap operation was discontinued between weeks 13 and 27.

All aphids shown in these graphs are able to transmit Barley Yellow Dwarf Virus. The sensitive period for the wheat crop in Cookhouse is indicated by the red line on the x axis of each graph which is shown in weeks.  Aphid numbers above 100 could indicate possible problems for the specific area.

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