Insects in field crops in Manitoba in 2011,
and forecast for 2012 The biggest insect concerns in cereal crops in 2011 were aphids, armyworms (Mythimna unipuncta), and thrips. Diamondback moth (Plutella xylostella) and Lygus bugs were widespread concerns in canola, and there were localized problems with bertha armyworm, Mamestra configurata. High levels of striped flea beetle, Phyllotreta striolata, in some canola fields in eastern Manitoba in mid- and late-July was an unusual occurrence. Soybean aphid, Aphis glycines, populations were at economic levels in many soybean fields from late-July to late-August. Levels of zebra caterpillar, Melanchra picta, were high and a concern to some canola and flax growers in late-August and early-September. Annual summaries of insect pests in crops in Manitoba are posted at: http://www.gov.mb.ca/agriculture/crops/insects/index.html
|