Well I did it a couple of days in a row when the thrips were coming in hot and heavy and I have had far less TSWV this year than last year when the thrips were not nearly as prevalent. A heavy enough dose of contact poison will kill the insect almost immediately. Most people who try to control them spray once a week or even less frequently and that is too hit and miss. I'm not even suggesting that you can stop the disease completely but if you time the spraying right I believe it does make a significant difference.
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