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Author Topic: Asian Citrus Psyllid Survival  (Read 262 times)

Millet

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Asian Citrus Psyllid Survival
« on: August 01, 2017, 05:51:05 PM »
The two major factors that have a significant impact on the development of psyllid population, and their survival, are the availability of new growth flushes for the female ACP to lay their eggs and the temperature.  In laboratory studies it was observed that approximately 50 percent of the ACP population can tolerate low temperatures at or below freezing (32-F) for two days,  These temperatures are below most citrus growing areas. ACP subjected to higher temperatures of 104-F to 114-F the survival rate decreased by 95 percent to 100 percent.  Therefor, it would appear that as temperatures increase or decrease from the optimal life temperature range of 68-F to 77-F, the rate of ACP mortality is affected.  The impact of higher temperatures have greater effect on the death rate than exposure to lower temperatures.

mrtexas

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Re: Asian Citrus Psyllid Survival
« Reply #1 on: August 01, 2017, 06:29:45 PM »
The two major factors that have a significant impact on the development of psyllid population, and their survival, are the availability of new growth flushes for the female ACP to lay their eggs and the temperature.  In laboratory studies it was observed that approximately 50 percent of the ACP population can tolerate low temperatures at or below freezing (32-F) for two days,  These temperatures are below most citrus growing areas. ACP subjected to higher temperatures of 104-F to 114-F the survival rate decreased by 95 percent to 100 percent.  Therefor, it would appear that as temperatures increase or decrease from the optimal life temperature range of 68-F to 77-F, the rate of ACP mortality is affected.  The impact of higher temperatures have greater effect on the death rate than exposure to lower temperatures.

I had psyllids one spring in SE Texas 5 or so years ago and the next winter we had a good hard freeze and they disappeared and didn't come back. Maybe the high temperatures where they grow citrus in California will be of some help. They appeared on my trees here in Sugar Land,TX this spring so I sprayed them the next 3 days and they also disappeared. We had a 19F freeze this winter two nights in a row so I hope it got them good in the rest of the area. So far no greening. Many of the trees I have in pots were propagated with budwood from 5 years ago. The 15 trees in the ground came from a psyllid free nursery or with certified bud wood.

AndrewAZ

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Re: Asian Citrus Psyllid Survival
« Reply #2 on: August 02, 2017, 12:36:57 AM »
Well, maybe the days in a row in Phoenix may actually be good for something!

usmcgy01

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Re: Asian Citrus Psyllid Survival
« Reply #3 on: August 16, 2017, 03:32:55 PM »
My friend Sharon has a banana tree and a papaya tree.  Neither tree has had fruit for 10 years.  She bought some OMG Fertilizer and within 3 weeks, both trees blossomed.
She said she bought it from www.omgfertilizers.com

fyliu

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Re: Asian Citrus Psyllid Survival
« Reply #4 on: August 16, 2017, 04:41:24 PM »
My friend Sharon has a banana tree and a papaya tree.  Neither tree has had fruit for 10 years.  She bought some OMG Fertilizer and within 3 weeks, both trees blossomed.
She said she bought it from www.omgfertilizers.com.

Welcome to the forum!

I think you posted in the wrong thread. Make a new thread if you want to post a product testimonial or recommend a product with some personal experience.

This thread has very low views so not many people are seeing what you want them to.

countryboy1981

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Re: Asian Citrus Psyllid Survival
« Reply #5 on: August 16, 2017, 04:45:23 PM »
Hopefully they will find a solution.  I think the least controversial if they can't cure the disease itself in infected trees would be to either breed specifically for or genetically modify the acp to not transmit the disease and release those insects to breed.

fyliu

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Re: Asian Citrus Psyllid Survival
« Reply #6 on: August 16, 2017, 05:05:45 PM »
Hopefully they will find a solution.  I think the least controversial if they can't cure the disease itself in infected trees would be to either breed specifically for or genetically modify the acp to not transmit the disease and release those insects to breed.
Good suggestion but this one's already been considered.

They considered releasing modified ACP similar to what they do with mosquitoes. I forgot why but they said it's not going to work. The bugs don't care about pheromone or something.

Researchers do consider and try all the options they have, even the ones that have potential dangers like parasitoid wasps. They studied them and did tests to make sure the wasps won't turn out to be a pest themselves. They should really post a list of the stuff they already tried so we can see if we have something new they should try out.

 

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