Do Japanese beetles like ALL roses?
kanuk
14 years ago
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krazee4rozez
14 years agokanuk
14 years agoRelated Discussions
Japanese beetles are all over on my fruit trees
Comments (30)Ace: Look's like you've got me here. The first FAQ indeed mentions control of the June beetle. This is one of those rare cases where product claims have actually understated their real ability to control pests. Oddly, the last FAQ on the list seems to directly contradict the first. This is the first time I have seen a claim that milky spore controls anything other than Japanese beetles. But the news may be better than that, based on experience here in the past growing season after application of milky spore (as I recall) in late June, 2006. The only previous milky spore application I made was around 1979, and the effect indeed lasted nearly 20 years, although it seemed to weaken in the last few years of that period, and I did have infestations of other types of beetles, as well as some increase in JB's. It turns out that the brown beetles I have always called June bugs are really one or another type of Chafer Beetle, which comes in the Masked Chafer, Rose Chafer, European Chafer varieties, and several other related species. The true June Beetle looks more like a Japanese Beetle on steroids, larger and flatter than the JB, but with a similar iridescent green color of the head and wings. This beetle has never been present in serious numbers here, but the Chafers have often defoliated particulars targets of their choice, especially plum trees and sweet cherries, and done quite a bit of damage to other fruit trees and garden crops too. Chafers feed mostly at night, and their season is usually shorter than the JB, but they are no more welcome. This past season, I not only saw no Japanese beetles, but almost no Chafers either, leading me to wonder if the milky spore had some effect on their larvae too. One swallow does not make a spring, and one season is not really a scientific test, but it is extremely unusual for me to go through a summer season with almost no beetles of any kind. One other thing I noticed in the FAQ's is some confirmation of my belief that the JB does not fly far before beginning to feed, and that the effects of the milky spore will continue to enlarge in area so long as there are larvae to infect. This is consistent with my experience, since I have no JB's, but properties only a few hundred feet away still do. It certainly seems worthwhile to put this milky spore down, although I would go with the pure culture that comes in a can, not the bagged stuff for spreader application which has a very low component of active spore. Don Yellman, Great Falls, VA...See MoreDo roses survive Japanese Beetle defoliation?
Comments (13)The risk would be to roses that are marginally hardy, so given your climate zone, almost all roses should be OK, and certainly Baltimore Belle. Judging from a study that has been discussed here, you might be able to protect foliage against severe JB damage without doing a lot of environmental harm. (Protecting the flowers is much harder because untreated petals are opening every day.) This would entail removing the open flowers first, then spraying with cyfluthrin, Pyola, or azadirachtin. The latter two are organic products. Cyfluthrin is the most effective. You can find a Bayer spray concentrate with cyfluthrin only (not cyfluthrin + Merit-- imidacloprid-- which will cause spider mite problems). Pyola is available from GardensAlive. Azadirachtin is the insecticidal fraction of neem oil which has been removed from the commonly available neem oil products, probably including whatever you are using. Read neem labels on garden counters until you find azadirachtin as an active ingredient. Pyola was more effective in the study, though. The organic products would need to be applied weekly, cyfluthrin every two weeks....See MoreJapanese Beetle resistant roses?
Comments (4)I don't think there is any pattern if you have plenty of JBs. I also noticed that it could differ year from year. In some years certain roses can look like less attractive to JBs but next year they will be among the most devasted ones. No pattern really. White, yellow, red, purple, fragrant, scentless - they will eat them all. The only one thing I noticed that is consisten from year to year is that foliage of old European OGRs is more attractive to JBs then any other rose foliage. Roses like Rose de Rescht, Konigin von danemark, Jacques Cartier are always get eaten alive, even small canes will go. Olga...See MoreRose Depression and Japanese Beetles
Comments (27)Another interesting chat on Japanese Beetles. I'm in the Ottawa area and after about 20 years of rose growing the Japanese Beetles have found me (and the Experimental farm's roses too). It's disgusting. Picking twice a day hardly makes a dent. Up until a few years ago I'd never seen one on my property. They prefer my scented roses like Hansa and Blanc double de Coubert. Hansa is a very deep color so I don't go with the light colored rose theory, as it seems to be their favourite. My Knockouts are not as affected and my Therese Bugnet seems to have its first big flush before the JBs come (and stay till September). I've tried geraniums unsuccessfully. But I've also read that they go for the tallest first. So, I think the geraniums would need to be raised on some sort of pedestal or bench to attract the JBs before they get down to the rose height. I tried pink geraniums and I've read white ones might be superior. I'm thinking that the same might go for any other sort of "repellant" that perhaps it should be raised higher than the roses to give any protection. Hmmm. Tall growing alliums that keep their leaves and stems all year, catmint on steroids? Mary...See Morejudith5bmontreal
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