Success!! The 'monsta' Japanese Knotweed
jant
15 years ago
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dejw
15 years agoRelated Discussions
Pokeweed and Japanese Knotweed
Comments (5)Is pokeweed considered an invasive native? I have not seen it spread as aggressively as JKW. I transplanted a Redtwig from the JKW infested area to my daughter's sandbox/planting heeling area, and the JKW has started to spread out from the small root that was inadvertently transplanted there. Being sand I can pull the rhizomes out and look for the main tap roots. Kinda like hunting for treasure. ON a postive note JKW is a source of an organic fungicide and apparently more palatable for eating than pokeweed. However the herbivore means of control doesn't seem to appeal to me very much. Maybe if the recession gets worse the JKW will look more appetizing?...See MoreKilling Knotweed Roots?
Comments (2)I am just in the process of getting rid of an invasive plant. How large an area is it? Are you willing to forgo planting anything else for the rest of the season? If you are, then let the plants come up a bit, then cover the area with black plastic to exclude light. Leave it on for the rest of the season. Not very nice to look at (especially when you consider you could have a nice flower bed there instead) but it works....See MoreJapanese Beatles need to die!!!
Comments (59)I tried milky spore - did not work very well. I think it is too cold here. This season I am trying a test bed with just NEEM. I tried neem last year - it was in the safer fungicide3 product. But the percentage of neem in that product was extremely low. I think it did not do enough. I will buy straight neem and apply it in a higher percentage spray and try that. I really would like to be able to rely on the neem it is so environmentally friendly. Others on these forums have been recommending products with imidacloprid. Such as Bayer and Merit. I have heard glowing reports on this although I do not know how organic and environmentally friendly this product is. Perhaps when applied at the correct time of day it will minimize contact with the "good" bugs. I have good luck with keepin the hybrid teas fairly beetle free because I only have a few bushes and they are for cutting only. If I can go out early in the AM and cut the buds before the beetles get them. I can bring them in the house and the tea roses open up nicely. I try to pick varieties that are good for cutting. This has worked for me. Basically I have no roses on the HTs for 6-8 weeks each summer. Although the 2004 infestation was the worst ever. Usually they last from Mid-July for about 4-6 weeks. This year they began July 4th weekend and lasted until the first hard freeze. Decimating every yellow rose and fragrant rose I have. They have no predators by me - I have heard tales that starlings like them, though I am in a semi-rural area and starlings like cities. (where there are no high beetle problems). Good luck next season all! I have updated regarding my wars with the beetles on my page...I update when I have new relevant beetle news!...See MoreHelp! Knotweed knightmare of a different sort...
Comments (7)First of all absolutely DO NOT let this plant grow tall and flower and have time to send its rhizomes to the center of the earth. With new shoots use Ortho Total Kill Lawn Weed Killer. It kills knotweed and many other weeds but does not kill your lawn. I've used it for the same purpose and it really works great. It actually lists knotweed in the list of weeds it kills. Wait until new shoots grow to about 3 or so inches tall with some leaf growth and then spray. The next day you will already see the knotweeed browning and curling over in its sure death. Also, be careful Ortho Total Kill comes in two varieties one that is safe for lawns and one that isnt. Look at Home Depot for the green bottle, not the blue one, if you do not want to kill your lawn. Also I would suggest buying the 32 oz. concentrate and making your own mix. Mix a tiny bit heavier to really feel the satisfaction of knocking this plant back to Japan from where it first came. Bye bye knotweed....See Morejant
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