Black Knot Fungus and non-toxic home made fungicide?
outsiders71
15 years ago
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dchall_san_antonio
15 years agolast modified: 9 years agoKimmsr
15 years agolast modified: 9 years agoRelated Discussions
Fungicide timing questions
Comments (18)To spray for what disease? some fungicide, bacteriacide like copper can be spray when trees are in a dormant stage. wettable sulfur ( micronized) can be mixed with water to spray as fungicide, may not be as effective as the ones you mentioned above. for spraying, you need to know what you spray for/ against and when to spray. You can always find info about fruit tree diseases by looking up fact sheets from various university extension services. Then, determine what problem you have,bwhat product you should use, when to use it. As you know spraying wrong product, wrong time, wrong diseases, won't benefit your trees. It may cause more damages. Pears and pears have different diseases, too....See MoreHow many fungicide sprays for fruit trees?
Comments (29)It was my understanding back in February of 2013 that the phase out was to be completed by 2017, with the newer label restrictions being the first phase. I haven't seen any new data that refutes or supports that lately though. The phase out was announce back in '06. Our network began in 2006 with the phaseout of all organophosphates due to the projected total phaseout and started coming up with alternatives as have many other extensions services around the country. Bonide is phasing out the Fruit Tree Spray that contains Captan, Carbaryl and Malathion (MPFS) and the new Fruit Tree & Plant Guard spray is replacing it. Unfortunately, Lambda-cyhalothrin, one of the major components of the new spray is highly toxic to bees exposed to direct treatment or residues on blooming crops or broadleaf weeds, ie dandelions, clover, etc. We actually had to remove all of those peach trees in 2006 because they ended up freeaing when we hit a spell of -26 temps the previous winter. We replanted new trees in 2013 and the jury is still out on those trees. We planted them in the southern most portion of our East orchard and they got sun all day long. We have lost all the new wood, but it seems that some of the 1"+ wood may have survived this past winter. The jury is still our as to how many survived. We should know in another week or two....as soona s we see some 60 degree + temps here!! All the apple trees have been hanging around green tip to 1/4" green now for over a week and the peach trees have not shown any green tip at all, but some of the wood is still green inside. Only time will tell!! We lost Reliance, PF 24C, and Contender back in '06. We now hacve PF 24C Cold Hardy, PF24C-007 and PF 7A and PF 5D. I'll let you know how they turn out!...See MoreBlack spot on roses, need non-toxic help
Comments (13)Buyorsell, that's anthracnose, not blackspot. Hard to find fungicides labeled for anthracnose on roses and it doesn't generally respond to the fungicides people use for blackspot. Neem oil is horrible. I do not recommend it to anyone. Not only is it worthless as a fungicide unless you have very little fungus disease pressure to start with, but it also kills ALL soft bodied insects including many beneficials, such as larval ladybugs, larval lacewings, and minute pirate bugs. I have tried it a few times, different brands, in different gardens. Same results every time - no effect on blackspot, and outbreaks of mites and aphids from the loss of beneficial predators. In our area there's rarely any need for insecticides on roses so no reason to use a combination of fungicide and insecticide anyway, even if it worked on the blackspot. I second the sanitation and early intervention recommended above. Kinda late now, judging from the OP's photo. Strip off the bad leaves, prune off canes with lots of purple spots (that's blackspot too), and start spraying regularly with something, anything, labeled for blackspot that you feel comfortable with. Sulfur and copper are very old remedies for fungal diseases. I use the heavy artillery myself, albeit at the longest spray interval recommended, and my dogs all seem to lead long healthy lives, for what that's worth....See MoreOrganic Fungicides - Yellow leaves and Spots
Comments (21)Whatever your reasons are, it's your decision. Nobody's trying to tell you what to do. But if you recommend it as being completely harmless to the ecosystem, you are not making a correct representation of the situation, period. I don't know what you consider "creditable" if study after study on ladybugs, bees, and parasitoids isn't enough. Granted, there are many more beneficial insects that haven't been studied on this issue, but since we understand quite a bit about what neem does to a wide spectrum of insects which are considered pests, there's really no reason to think that just because humans classify others as "not-pests" that neem is going to treat them differently. stevie: besides, it's whats more safe for me. i would rather ingest some neem oil with my kale than BT, or many other pesticides that might be considered organic (copper?) BT is a harmless bacterium to humans. In addition, any residue washes off very easily unless you use a sticker. Copper is toxic in high doses, yes, but the amounts you'd get even if you didn't wash vegetables would be well within the margin of safety for most people, and organic formulations wash off very easily. Neem, meanwhile, is not always harmless to humans. Plus, neem is an oil, which won't rinse off easily with just water, so you're much more likely to consume neem residue than BT residue or copper residue. In the end, none of these choices is likely to harm you, but you'll be consuming more of the neem than the other applications. Once again, you decide the way you want to decide. But don't misrepresent facts out of ignorance to other people. People need to be given accurate information so that they can make their own decisions. stevie: there are far worse things your next door neighbor might be using. I try not to use what everyone else does as a basis to rationalize choices that I personally feel I shouldn't be making....See Morejustaguy2
15 years agolast modified: 9 years agogardengal48 (PNW Z8/9)
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