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Cycas species resistant to aulacaspis yasumatsui (Asian cycad scale)


MOlivera

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I was wondering if anyone has had any experience with Cycas sp. that are resistant to aulacaspis yasumatsui or the cycad Asian scale? Any info would be appreciated. Mike 

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  • 3 months later...

I know of none for sure.  Maybe some of the Australian species and blues due to their difference in leaf structure?  Basically all of the ones that don't like to live in a wet tropical area?Purely a guess.

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Cycas taitungensis has been scale free for me. I have had rev's right next to them covered in scale & nothing at all on the tait's None of my tait's have ever had scale.

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I known for a fact that tait is not resistant.  Maybe scale prefers revoluta over other species? 

Ive never seen scale on ceratozamia, macrozamia or encephalartos either. Cfkingfish or one of the guys that work at MBC or fairchild might be more help as they have had various genus in close proximity. 

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Around here the species that have been  most affected that I have seen are Cycas revoluta and C. taitungensis. In SoFL C. rumphii (C. circinalis) were hit bad but around here not as much. Here at Leu Gardens C. rumphii has never had it or only lightly infected. We have had it on Cycas angulata, guizhouensis, media, megacarpa, and panzihihouensis but not bad infestations like C. revoluta gets

Its a shame about C. taitungensis. In the mid to late 90's they were starting to appear in quite a few commercial landscapes in this area. But when the scale first started showing up here and attacking C. revoluta the C. taitungensis got it just as bad and most were removed. With less Cycas revoluta in landscapes now the scale infestations have really decreased dramatically. 

I have never seen it on any other cycad genus other than Cycas. 

Eric

Orlando, FL

zone 9b/10a

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C. revoluta are WWWWWAAAAAAAAYYYYYYY OVERUSED up here. I'm almost kind of glad they are being purged: only in the sense that...

....ones in people's yard who don't really care about plants (most cases) are dying, and ones in people's yards who care and know how to treat them survive. We have kept our large specimens alive with regular application of the oil.

And much of the time it happens that the cycads in yards of non-plant people are the ones planted willy-nilly right next to oak trees and holly bushes and look really out of place- not gonna miss those ones that die.

Edited by Opal92
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Here's a perfect example. I took these last year. The rev has a bunch of scale & the tait has none, right next to each other.

 

2uooo5x.jpg23kdahx.jpg

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I have also observed in Hawai'i that C  revoluta and rumphii are the favorite meal.

other Cycas groups show this like bifida being more resistant than debaoensis

recently experimenting w salt water sprays to discourage, as plants growing near coast rarely have infestation

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19 hours ago, Kokioula said:

I have also observed in Hawai'i that C  revoluta and rumphii are the favorite meal.

other Cycas groups show this like bifida being more resistant than debaoensis

recently experimenting w salt water sprays to discourage, as plants growing near coast rarely have infestation

Interesting find.....let us know what you determine with the salt water sprays.

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  • 1 month later...

These are the cycads I have in my 25'x25' garden. All are in pots. Here are the results of which ones are infected by the scales. When I decided to get rid of the scales for good, I was successful in doing so. But you need to make that decision and go and do it. I have not seen the scales again so far for the past 6 months.

A-TomPlant.jpg

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