The tolerance of onion varieties to onion thrips feeding was rated in field experiments at Fruita Colorado in 2001 and 2002. Four insecticide screening trials and alternate host plant studies were also conducted. The greatest response to insecticides were in long season full Spanish types, suggesting that they are least tolerant to thrips feeding. Lannate LV was found to be the most consistent insecticide in reducing thrips numbers, but control never exceeded 60%. Onion thrips were abundant in the spring on whitetop, but could also be found on several other weed species. An integrated onion thrips management program bases on these data will be discussed.
Species 1: Thysanoptera Thripidae Thrips tabaci (onion thrips)
Keywords: tolerance, chemical control
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