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From 1998 to 2003, excluding 2001, patterns of insecticide use and virus incidence were established for between 43 and 69 fields per year of autumn sown wheat in Canterbury. Fields were visually inspected for barley and cereal yellow dwarf virus (YDV) in November and December each year. Growers were surveyed on their use of insecticides to control aphids in these fields between emergence and growth stage 30 (the period when the plant is most susceptible to YDV). The proportion of early sown (before 1 May), mid sown (1-15 May) and late sown (after 15 May) crops remained similar throughout the surveyed period. There was a substantial increase in the use of imidacloprid (a seed treatment) and foliage sprays of synthetic pyrethroids while the use of organophosphates reduced. Between 1998 and 2003, fields in which virus incidence was >5% of the visible flag leaves declined from about 25% to near zero. High virus incidence occurred in some (but not all) crops: in a year with extensive aphid flights (even in crops with protectant insecticide applications); in early sown crops without insecticide protection; and in mid and late sown crops without insecticide protection in years with warm June temperatures.

proceedings of the new zealand weed and pest control conference/new zealand plant protection/proceedings of the ... national weeds conference/proceedings of the new zealand weed control conference/proceedings of the new zealand plant protection conference

The incursion of the lettuce aphid into Tasmania could it have blown over from New Zealand