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2 Problems
I got an email from someone who reads this newsgroup who I know to be very
knowledgeable but who only lurks here. He suggested I consult my pest management textbook on thrips with regard to their soil dwelling stage. The text book points out that Thrips pupating in soil are very susceptible to moisture and the associacated fungus problems. So in this respect, the natural controls on them are just the opposite of fungus gnats. Damp decomposing media posses a greater threat to their life-cycle than dry new media. They can be easily drowned in just water and or fall prey to the same decomposing fungal organisms that are breaking down the media. I suspect thrips live cycle would be easily disrupted in the semi-hydro method of potting orchids if they have no place else to pupate. "Al" wrote in message ... Once the third stage instar begins they stop eating some may even develop wings, fly off or simply crawl down into moderately or well decayed potting media to pupate. Like fungus gnats, this instar requires potting media that is very moist and on the decomposed side in order to do well. Dry and/or new potting media will make it hard for both fungus gnats and 3rd stage thrip larvae to survive in it. |
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