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Proper time for chemical control of thrips, Thrips tabaci Lindeman, 1888 on onion, Allium cepa L



Proper time for chemical control of thrips, Thrips tabaci Lindeman, 1888 on onion, Allium cepa L



Anais da Sociedade Entomologica do Brasil 2(1): 71-76



Proper time of chemical control of thrips on onion was studied under field conditions at Londrina, PR, Brazil. The treatments consisted of insecticide application always when thrips reached determinated levels (0, 20 +- 5, 30 +- 5 and untreated). At intensive insecticide application plots (weekly applications), productivity did not differ from that observed on plots where treatments were made when population levels reached 20 +- 5 thrips/plant. Results showed that a 40% bulb yield reduction occurred on non-treated plots as compared to treated ones.

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