C. Moschata Summer Squash Varieties Tolerant of Squash Vine Borers
Okiedawn OK Zone 7
9 years ago
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Shelley Smith
9 years agoRelated Discussions
Good article on Squash Vine Borer and Squash Bug
Comments (8)Nice link, and a very good article. The ATTRA publications are very useful for organic gardening... I still haven't worked my way through all of them. SVB is terrible in my area, and would kill up to 100% of my C. pepo and C. maxima squashes without protection. For the past 3 years, I've applied floating row covers over those squashes after planting (I use transplants). The row cover is buried at all edges, and remains on until female flowers have appeared, or until the vines outgrow the cover. This appears to protect the plants during SVB egg laying, because I've had no infestations at all on covered plants. Not only that, but there have been very few squash bugs, and the population of cucumber beetles is much reduced. I could not grow squash reliably without this method. A couple of my own observations. As quoted from the article, ..."Supplemental fertilization may be necessary to promote the vigorously growing plants that can tolerate one or two borers and still produce a crop through additional rooting along the stem." My own observations have been that fertilized squash plants seem to be more attractive to squash bugs & cuke beetles. This would seem to make sense, since the compounds which attract the insects might be released in larger quantities, under the more rapid growth caused by the fertilizer... particularly the high-N fertilizer that stimulates heavier foliage. Because of this observation, I stopped using fertilizer on my squash two years ago, and the pest pressure has been much less than in previous years. Unfortunately, my yields without fertilizer have also been noticeably lower. It may be that low-N fertilizer, and/or later application, might offer the best of both worlds... I will be experimenting further in that direction. "The buttercups always seem to develop supplemental roots, never the moschatas which are resistant anyway. The more I work with OP summer squash (C. pepo), the more I see stem re-rooting, which really does help them survive borers. The OP yellow crookneck from Fedco ran 14 feet and rooted like crazy." The tendency to root at the nodes is present in all squash species, but varies by variety. I grew some of the smaller Butternuts, which were very reluctant to root. "Tahitian", also C. moschata, roots aggressively. One year, I hybridized a Butternut with "Tahitian"; the resultant seed produced very large butternuts, and vines that rooted heavily. One of the rave reviews on the Cornell site for "Zucchetta Rampicante" is mine. ;-) It roots very aggressively. Some years it gets attacked by SVB (I can see the frass) but it seems to kill the larvae, and the vines show no sign of infection later in the season. Squash bugs also might attack it when the plants are young, but once established, nothing touches it. Oh, another pest observation. When I see swarms of cuke beetles attacking a particular plant of "Zucchetta", I nearly always find a mature squash bug attacking the stem. The reaction of the plant to this attack - and its weakened state - appears to attract the beetles. The single squash bugs are easily killed with a soap spray. Last year, I grew several naked-seeded C. pepo pumpkins for trial. The semi-bush "Kakai" was very reluctant to form roots; and it has been very susceptible to SVB for me in the past. "Little Greenseed", on the other hand, had long vines & rooted wherever it contacted bare soil. If SVB attack can't be prevented, choose varieties that have demonstrated good rooting potential....See Moresquash vine borer
Comments (14)Tulle rocks. If you have vining cucurbits, you can actually keep them in a line, under several yards of standard 52" width tulle. The stuff is cheap. Actually, you can bend the vines around so you have two parallel strands of vines as they grow. That's a nice way to fill up the space available under that width of tulle. That's what I've done this year. If you have more vertical and bushing squash (e.g. zukes), you may have to sew some widths together to fully contain the plant. Of course, don't do this in an area that was infested in SVBs last year. You'll just seal them in. You will probably have to pollinate manually, but here's a hint. Don't pollinate a female flower with a male flower from the same plant. That's called "self" pollination, and in general is not a good thing (as in, inbreeding). For recessive characteristics that are undesirable, inbreeding hurts. Yes, many plants self pollinate within individual flowers (e.g. nightshade family), but that isn't optimal....See MoreSquash Resistant to Squash Bug and Squash Vine Borer
Comments (16)I have grown Tatume here a couple of times. While it outcompetes squash bugs, the squash vine borers still can kill it in a year when they are really bad. I don't grow it any more because we liked the flavor/texture of Seminole harvested young (baseball to softball-sized) better than Tatume. It is a huge space hog too, and because I already grow 6-10 kinds of C. moschatas most years, the last thing I need is a space hog that isn't as tasty as they are. Bon, I couldn't help noticing how many of my favorite Texas horticulturalists (Sam Cotner, Malcom Beck, Howard Garrett) were in Howard Garrett's story about Malcom's pumpkin. (Mr. Garrett and Mr. Beck write extensively on organic gardening and all their books are excellent, and Mr. Cotner wrote THE book on growing Vegetables in Texas. I've worn out 3 copies of it and am on my 4th.) Jay White, by the way, writes regularly for Texas Gardener magazine (as does Greg Grant) and their articles and columns are the first ones I read when a new magazine arrives. It is a well-known and well-understood phenomenon that healthy plants grown in healthy soil are more disease tolerant and more pest tolerant than less healthy plants. When pests relentlessly attack plants, I try to figure out what it is about those specific plants that make them less healthy and, therefore, more alluring to pests and to diseases. Sometimes it is obvious to me because the plants under attack are growing in less healthy soil. Sometimes it is something much more subtle---like cool-season plants that are beginning to be subjected to hotter temperatures than they like. Howard Garrett makes a convincing argument for us to grow our brassicas in the fall only in this part of the country because they have less pests since they are less stressed in cooler conditions---and I believe he is right about that. And, there are some pests, like grasshoppers, that relentlessly attack everything still green in the hot summer months, whether the plants are healthy and happy are not. So, for every "rule" that we observe, their is an exception, and I find grasshoppers to be one of the exceptions to the rule that healthy plants in healthy soil are not attacked by pests and diseases. I grew up eating yellow summer squash for as far back as I can remember and nothing I've ever grown as a more pest-tolerant substitute for it is 100% acceptable. When I want yellow squash, I simply want yellow squash---nothing else will do. So, in order to have it, I just grow it in low tunnel rows under row cover and hand-pollinate it. I feel like I don't have to settle for less in my own garden, and growing Tatume instead of the yellow squash I really want is, indeed, settling for less. You'll never know how you feel about Tatume until you grow it yourself. I just wasn't crazy about the flavor and didn't find it to be a really heavy producer either. To be fair to Tatume, it never will look like a heavy producer when it is grown adjacent to Seminole because Seminole outproduces it (and everything else) every single time. There is a reason Seminole is a perennial fave in our garden----it is beaten everything else for about 15 years now, and that track record is hard to break. It has been around forever....I can remember it being on seed racks in Texas when I was a child, although I think then it likely was sold as Calabacita, because that is the name that pops into my head every time I see a packet of the seeds. For squash vine borer tolerance or resistance, as George noted, C. moschatas will win every time and, for me, the C. agyrospermas like White Cushaw, Green-Striped Cushaw and Orange-Striped Cushaw are in second place. Tatume might come in third, or actually, a distant fourth behind every kind of yellow summer squash that exists when grown under row cover. YMMV. You can grow any squash or pumpkin you want if only you'll grow them under summerweight row cover, tulle netting, mosquito netting, etc. and hand-pollinate. Does it take longer and a bit more effort? Sure it does, but it is worth it to avoid the heartbreak of losing plants to the dastardly SVBs. Dawn...See MoreSquash Vine Borers
Comments (6)kfrikle, Oh, I am so glad that Early Bulam is working out well for you! I am about to plant it (tomorrow I hope) for fall, I had yellow straightneck for spring, planted extra-early to beat the first generation of SVBs and that worked out well. I was concerned that with your heavy infestation of SVBs last year, you'd have another horrible year this year. Now you see why I rave on and on every year about Seminole. I used to say "it won't die and you can't kill it", but I have had one plant die here or there, usually at the rate of about 1 per year, but I plant a lot of them so I don't even miss that one. So, technically, it will die....but not easily, and most C. moschatas are the same way. The more C. moschata types I grow, the more I like them. The fact that they store a long, long time is just the ice cream on the cake as far as I'm concerned. I don't mind doing a lot of canning, dehydrating and freezing (and some fermenting) of the harvest to store home-grown food for us to enjoy over a longer period of time, but the fact that with C. moschata, it stores itself, means that is just one less food harvest that I have to process for storage. In a rainy year Seminole will take over the whole garden, but I don't care. By the time the vines are rambling far and wide, everything else is fading away in the summer heat. Late production of Seminole fruit has never been a problem. I have picked them very green before the first hard freeze, and lined them up on tables in the garage, and they colored up over time and tasted perfectly fine when we finally got around to eating them months later. I've even missed some of them under the dense vines, had them endure multiple freezing nights (I found some in December a couple of years ago--might have been in 2011--that I missed earlier) over a long period of time and they were fine too. Their rind is so dense that I think they can endure almost anything. Mike, For the first few years that we lived here, I could (and did) grow every kind of pumpkin and squash imaginable. I believe the SVBs didn't find us until we'd been here 7 or 8 years. I suspect no one who lived within a mile or so of us was growing pumpkins or squash, and there must not have been many native ones around, although we had the buffalo gourds growing wild on our property. I grew up to 30 varieties per year because I knew that once the SVBs found us, I'd have to switch over to C. moschata, and there's not nearly as many of them as there are C. pepo and C. maxima types. It was fun while it lasted, but I knew it wouldn't last forever. Sometimes I can grow any of the Cushaws (green, orange, white, etc.) and they survive the SVBs too. I don't know why, but I'm glad it happens. Every now and then I grow some normal pumpkins---I like growing Knucklehead, for example, and One Too Many, but it is hard to beat the SVBs. In my dream garden, I'd have a medium-sized hoophouse (at least 15' wide by 30' long) covered with Proteknet's thrip netting, which I think would keep out the SVBs, and with the plants grown in raised beds lined with quarter-inch hardware cloth to keep the voles from eating the plants. It's never likely to happen, but that's the beauty of a dream garden---it isn't real. I don't care what we do....I don't think we'll ever eradicate them. There's too many wild squash type plants in various parts of the country that they could eat. It's a lovely dream, though. There's a reason the huge commercial fields where they grow pumpkins and winter squash (most of the canned pumpkin sold in this country is actually a C. moschata variety of winter squash) are not in the southern part of the country. I imagine there's systemic pesticides commercial growers can use, even in the south, to thwart the SVBs, but even if those types of pesticides were (and, for all I know, they may be) available to home gardeners, I still wouldn't use them. Dawn...See Morechickencoupe
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