Grubs.........Milky Spore question...
20 years ago
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- 20 years ago
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milky spore application questions
Comments (9)Thomis: Milky spore is available in two forms, that I know of. There is the pure spore, available in small amounts, but best purchased in 44 ounce cans at a price of about $80. Nominally, one of these cans can cover 10,000 sq. ft., but in actual experience will cover much, much more, if you are able to properly distribute it. Applicators sold with the pure spore consist of a long, cardboard tube with the business end equipped with openings much like a can of ground black pepper or other spice. You fill the tube with pure spore, than walk along bumping it on the ground, attempting to drop anywhere from 1/2 to 1 teaspoon on a recommended 4-foot grid. This procedure is necessarily imprecise, but the objective is coverage, not precision. I have found, by actual experience, that I can expand to an 8-foot grid or even larger with little to no loss of effect, and the amount dropped with each bump can be miniscule. I used three 44 ounce cans on my own acre, but took a single leftover can to my son's place where I did two acres. All of my Japanese beetles were gone within about one year, but so were his. That taught me something. This is a biological product, and if conditions are right, it will propagate itself over a very wide area. It spreads by infecting beetle larvae in the ground, which then explode and produce millions of new spores. It slows or stops propagating when it runs out of larvae to infect. I applied milky spore to my place in July, and did my son's property in August, but I don't think it makes much difference what time you do it during the summer months. A common formulation of milky spore sold today is a granular product, consisting of a very low percentage of active ingredient mixed with a carrier designed to make it possible to apply with a broadcast spreader. This makes it more convenient to apply, especially if you already have a broadcast spreader (the cardboard tube applicator costs a little over $10). Whether you choose the pure or spreadable product is a choice for you to make, but in terms of cost I think you get a lot more active ingredient on the ground with the pure spore, at the cost of a slighly more complicated method of application. I have found milky spore to be effective against a range of beetles much wider than I originally thought. In addition to eliminating JB's, it has also wiped out the tan/brown night feeding chafer beetles (that love plum leaves) and even the larger, green June beetles. When I applied, I had plenty of product (about $300 worth) and went about 40 feet into my neighbor's properties on three sides. That may have helped me, and it certainly helped the neigbors. Whether you mow before, after, or during the application of milky spore is irrelevant to the action of this product. The point is to get it on the ground, and it may be helpful to have a little rain shower after you do to wash it in. I suppose that if you mowed right after application, while the pure spore product is still dry, it might actually help to spread it between the grids where you have placed it with your dop stick. Don Yellman, Great Falls, VA...See MoreMilky Spore application question
Comments (4)Bart: I said I happened to do it in July on my son's place, but that was accident not choice. Earlier is better. If your bag says to do it three consecutive times - once in spring, summer and fall, that is different than the stuff I used. I don't know why they would say that; this should be a one-application product, if done properly. But you can do it any time during the summer. Don't make it more complicated than it really is. I applied it throughout the vegetable garden and all the beds. Obviously, I don't think there is the slightest risk of harm, but you may be able to search out other opinions. Check out yardiac.com for good prices on the pure spore, not the dilute stuff intended for spreader application. In larger quantities it gets a lot cheaper. I don't know how you would apply it to many acres but you may be able to mix it with an inert ingredient like lime and spread it that way. It will be a lot cheaper if you start with the pure product and mix it with something yourself. Sort of like combination fruit tree sprays; you end up paying about ten times as much for the same amount of chemical if you bought them separately. If you are going to limit application, starting under the trees or plants you wish to protect sounds reasonable. Don Yellman, Great Falls, VA...See MoreImportant Info RE OE Spores & Monarchs
Comments (0)Important Info RE OE & Monarchs! Posted by tdogmom on Tue, May 2, 2006 Okay folks, I got a response from Dr. Sonia Altizer, an expert on Monarchs, from U of Georgia. Several people have asked questions about using a 2% bleach solution to cleanse OE spores when working with Monarchs. I asked her some of those key questions and here is what she said. I paraphrased and summarized her reply to each question. 1. Is it possible to clean Milkweed plants while they are in the ground (planted MW plants)? This is NOT recommended. Spraying wild plants growing out in the field with 2% Chlorox is not very effective against the tough OE spore walls. An alternative is the following: Take Milkweed cuttings (clip the stalks) and soak them in a basin in 10-15% Chlorox for 20 minutes. Then, soak them in regular tap water for the same amount of time and rinse well. The cuttings can then be placed in florist tubes (plant picks) and fed to the caterpillars. Dr. Altizer has found that if the leaves are rinsed well in tap water, they can be fed safely to Monarch larvae. 2. If you find a lot of OE in the Monarchs raised, it is possible that the spores are on your plants. What is another way you can eliminate or reduce the OE on the Milkweed? To reduce spore loads on plants, cut the stalks (or mow these down) to within a few inches of the ground. New material that grows back should have fewer spores on it, especially if kept away from infected adult butterflies. If necessary, use netting to keep the butterflies off the plants. Presumably a heavy rain or a strong hosing with water can also wash off a large portion (but not all) of the parasite spores. Dr. Altizer also recommends growing native milkweed species as opposed to the tropical species, as most of the native species naturally die back during the winter months, and hence would accumulate fewer parasite spores. 3. Can you use a bleach solution to cleanse Monarch eggs of OE? How safe is this and is it effective? This approach is NOT recommended as bleaching the eggs has NOT been found to be a satisfactory method of elminating OE. The concentration of bleach needed to kill the OE spores can also damage the egg chorion. A method to try to rescue some potentially contaminated eggs is to remove them from the Milkweed they're on (the contaminated Milkweed) and transfer them to a clean Milkweed leaf. This will reduce the potential number of spores the caterpillar might ingest. 4. What about the use of the commercially prepared OE spore spray? She was not familiar with the Educational Sciences product. Her exact words, "I'm not familiar with this product so cannot make an educated comment, except to say that there are probably cheaper, easier, safer and more effective methods available than using a commercial spray -- and definitely would not advocate widespread dissemination of a product such as this into the environment. 5. Is there a way to test the Milkweed plant itself for OE spore contamination? She felt this was a good question and thought that perhaps this could be done similarly to the way OE is tested on the Monarch butterflywith a swab, tape, etc. I think that her answers were very clear. I also felt good because personally, I have always been concerned when reading about people using bleach to clean their butterfly eggs. It is reassuring that someone who does a lot of research corroborates my own thinking and methods. :) So, take it for what its worth--CalSherry aka tdogmom....See MoreMilky Spore VS GrubEx?
Comments (6)Milky spore is actually a bacterium that targets Japanese beetle larvae. It can be applied any time the ground is not frozen but is most effective in late summer-fall as that is when the grubs are most actively feeding. Once the grubs consume the spores and are infected and die, their decaying bodies release billions of new spores that spread and infiltrate in other parts of the garden. The spread of the spore is really dependent on the grubs eating the stuff and spreading it around, so summer/fall applications have the most benefit. However the product has a long shelf life, so if not needed or used now, it can keep in a cool, dry situation until next season....See MoreRelated Professionals
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