New Zealand Plant Protection 57 (2004): 233-238
Since its arrival in March 2002, lettuce growers in New Zealand have been struggling to control the lettuce aphid (Nasonovia ribisnigri) using topically applied insecticides. Potter tower tests have shown there is some level of resistance in New Zealand to two insecticides (acephate and methomyl) at the recommended field rate. A field trial was set up to examine the effectiveness and persistence of six insecticides on autumn sown seedling lettuces for control of the lettuce aphid. Acephate and methomyl failed to give complete kill of lettuce aphids, unlike the other four insecticides tested. The synthetic pyrethroid, lambda-cyhalothrin, gave a higher level of protection, having both a longer persistence period than the other insecticides tested and a significantly lower rate of increase in aphid numbers.
Keywords: Lettuce aphid, lettuce, insecticides, control, persistence.
|Testing for pesticide resistance in lettuce aphid|
P.J. Workman, M.A.W. Stufkens, N.A. Martin and R.C. Butler (2004)
New Zealand Plant Protection 57: 239-243
|Distribution, host range and flight pattern of the lettuce aphid in New Zealand|
M.A.W. Stufkens and D.A.J. Teulon (2003)
New Zealand Plant Protection 56: 27-32
|Nasonovia ribis-nigri, a new aphid pest found on lettuces (Lactuca sativa) and Ribes spp. in Canterbury|
M.A.W. Stufkens, D.A.J.Teulon and S.R. Bulman (2002)
New Zealand Plant Protection 55: 437
Copyright © 2004 New Zealand Plant Protection Society (Inc.).