There is no known insect resistance to Transform, or cross-resistance between Transform and any other insecticide group.
Simply put, compared to the dose required to kill a susceptible GPA population, this multi-resistant GPA population required 60 times the dose of deltamethrin and pirimicarb and almost twenty times the dose of imidacloprid. The Transform dose required was the same whether the population was resistant to these other insecticides or not.
The fact that Transform insecticide will control aphids resistant to other commonly used insecticides in Australia (e.g. OPs, SPs and pirimicarb), was strongly confirmed during the winter of 2014, in approximately 400,000 ha of canola grown in South Australia, Victoria and New South Wales.
Field trials have demonstrated that Transform is not only effective against aphids but, due to its rapid knockdown, it also slows transmission of viruses by rapidly controlling the aphid which vectors the disease. Plenty of commercial experience in the southern cropping regions in 2014 confirmed that not only did Transform rapidly control GPA but it stopped the spread of the very damaging beet western yellows virus (BWYV).
“A one in 20 year event!” said Richard Noll (NTS Rural Kapunda). Having worked in South Australia’s lower mid north since 1992, he certainly has the experience to back his statement up. As he walked through canola paddocks around Kapunda, Richard found that a lot more damage was caused by the sucking of the green peach aphid than from the virus.
“The Kapunda area got hit pretty badly with green peach aphid about 5 weeks after seeding. Some farmers in the area went out with Pirimor® early and it didn’t work so those crops got knocked around quite a bit.”
Figure 1. Resistance ratio of green peach aphid resistant to multiple insecticides (data generated by Rothamsted Research, UK).
“We were pretty lucky that we got on the Transform bandwagon early. It killed
the aphids no trouble at all. Then the crops were able to recover quite well. We heard that it was expected that there would be 60% yield loss and we haven’t seen that at all.”