![]() ![]() If a person sprays PyGanic twice a week for six weeks then the season-long cost of spraying organic insecticides would amount to $924. $77.00 per application, using the high label rate. For example, the cost of spraying PyGanic® 5.0 EC (an OMRI-listed insecticide that is based on pyrethrins) against adult Japanese beetles in one-acre plot is approx. This can actually lead to applying more product on a given area because of the tighter treatment intervals. As a general rule, organic insecticides are more expensive than their synthetic counterparts and their residual effect is much shorter. While many synthetic insecticides are available to control Japanese beetle in the adult stage, there are very few materials approved for organic pest control. When exploring chemical control options, farmers/gardeners should select the lowest risk and the most effective products. InsecticidesĪpplication of insecticides to control pests including Japanese beetles should be considered the last resort. Nematodes mostly die in winter so they will need to be reapplied annually.įor both milky spore and nematode applications, be cautious with your expectations! Reduced numbers of adult beetles emerging in 'your' yard doesn't prevent them from flying in from areas that aren't treated. Soil temperature needs to be at least 44 degrees F and it needs to stay moist (water every 3–4 days). Usually, two applications-7 days apart, are recommended. Nematodes need to be mixed with water to apply using a backpack sprayer. Cost to treat 1,600 square feet is about $30. NemaSeek® consists of live beneficial nematodes that actively search for grubs in the soil. There are also several species of nematodes (tiny round worms) that attack Japanese beetle and other soil-dwelling grubs. Picture by Whitney Cranshaw, Colorado State University, Japanese beetle larvae killed by Heterorhabditis bacteriophora next to two healthy larvae. While this significantly increases the expense, it is claimed to give faster control, for up to 20 years. The number of applications recommended by the label should be considered, applying Spring, Summer, and Fall for two consecutive years (six total). ![]() It works best to apply it just before rainfall, or consider watering in lightly after application to soak into soil. This product is most effective when applied in early- or mid-August, when the grubs are actively feeding. Cost to treat 2,400 square feet is about $30. One example of a commercially-available formulation of Milky Spore is produced by St. When spores of Milky Spore are ingested by Japanese beetle grubs, they die and in the process they release billions of new spores into the surrounding soil. ![]() One naturally occurring bacterium that is commercially available is called Milky Spore®, which is an option for controlling grubs in the soil that damage the lawn. However, there are some pathogens (organisms that cause diseases) that attack the grubs in the soil. Some species of parasitic wasps that attack Japanese beetles in the grub and adult stages have been introduced into the country, but they are not commercially available. Japanese beetles are not native to the U.S.A., so there are very few natural enemies that could keep them in check. Organic Management Options for the Japanese Beetle Biological Control Your pest management strategy should be "proactive" not "reactive." Don't wait to see catastrophic damage before acting. Feeding damage to plants can happen within 48 hours. If you are checking your plants, you might not see any beetles on a cold, rainy day – but don't assume your pest problems are over! Thousands of Japanese beetles may burst from the ground on the very next day if it's warm and sunny. If it's cold and rainy, they may not become active until late June.ĭaily feeding behavior is also subject to weather. For instance, if warm, humid conditions occur – they will emerge earlier. The timing of the onset and end of Japanese beetle adult activity may vary by a couple weeks depending on weather. In mid-Missouri, significant numbers of Japanese beetles begin emerging in mid to late June, the population peaks the second week of July, and declines by early August. Conversely, if a feeding frenzy starts, it will be difficult to remove the beetles unless insecticides are applied. If you are able prevent beetle aggregations by dislodging or killing the first arrivers, you may be able to limit the damage. ![]() This results in aggregations of beetles, triggering a feeding frenzy. Feeding on plant tissue by adult Japanese beetles causes the release of plant volatiles from the damaged sites, and of additional pheromones from females. ![]()
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