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OSU Extension - Auglaize County Weekly Horticulture Newsletter – 8-7-20

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OSU Extension - Auglaize County Weekly Horticulture Newsletter – 8-7-20 Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu OSU Extension - Auglaize County Weekly Horticulture Newsletter – 8-7-20 What is the White Substance on my Cucurbits? Squash, pumpkins, gourds, and muskmelon are most susceptible to powdery mildew, but watermelons and cucumbers may get the disease as well. Powdery mildew is here. I found it first in my neighbor’s garden, but then found it in mine. Powdery mildew starts first as pale yellow leaf spots on the oldest leaves of a plant. White powdery spots then form on the upper and lower sides of the leaves. These spots quickly expand encompassing large areas of the leaf, ultimately infecting the entire leaf, petiole, and stem followed by additional leaves. The youngest leaves of a plant are resistant to infection. Powdery mildew can colonize nearly all of the leaves on a plant and reduce fruit size and yield. The pathogen, Podosphaera xanthii, is believed to be airborne dispersed over long distances from southern states. The pathogen will infect plants under low (50%) to high (95%) relative humidity and mean temperatures of 68 to 80 °F, although the pathogen can infect at temperatures into the 90’s. Dryness is favorable for colonization, sporulation, and dispersal. Symptoms may appear within three to seven days after infection, usually attacking the densest and lowest light intensity areas of the canopy first. Leaves become susceptible 16 to 23 days after unfolding. Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu The most effective way to manage powdery mildew is to plant disease resistant varieties. There are some biological fungicides that are antagonistic fungi that can provide some control. Excessive nitrogen makes powdery mildew worse. Fungicides are only protectant sprays, so fungicides need to be applied at the first sign of the disease! The fungicides need to be applied every 7 to 10 days. Thorough coverage of the leaves (including underside) and stems are critical to maximizing control. Ways to maximize coverage is to apply high volumes of the spray mixture, apply at higher pressure, and use a smaller spray droplet. Chlorothalonil is likely the only fungicide providing control that can be purchased at local garden centers. However, this product only provides fair control. Having only one fungicide is not good since the fungus can become resistant to fungicides. It is best to switch fungicides every other application to reduce the risk of resistance. Other products available to control powdery mildew include Inspire Super, Procure, Quintec, Rally, and Aprovia Top, but they will need to be purchased at a local agricultural retailer. Another option to get ahold of the products is to purchase them from ebay or Amazon. Inspire Super, Procure, Quintec and Rally can be purchased from ebay, likely in smaller quantities than at an agricultural retailer and Rally can be purchased from Amazon. The most effective organically approved fungicide is sulfur. Thorough coverage is important. Sulfur can be phytotoxic when temperatures are hot. Other effective organic fungicides include Actinovate SP, Eco E-rase, MildewCure, JMS stylet-oil, Kaligreen, MilStop, Organocide, Regalia, SeaCide, Serenade, Sonata, Sporatec and Sporan, and Trilogy. I am not sure of the availability of these products at local garden centers. Another organic option is to apply a 30 to 40% solution of milk to the plants. Results have been variable, but it is worth a try if you start when you see the first lesion. Magnolia Scale Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu It is time to scout your magnolia trees for magnolia scales. Infestations can become large enough to begin killing the branches and retarding growth. Magnolia scales are tan in color, about ½ inch in diameter looking like half sea shells and having a white waxy coating covering the shell. Young scales (crawlers) will be hatching very soon if they have not already begun hatching. Scales are sap feeders and if the population is large enough the excrement can cause leaves to turn black with sooty mold. The most effective way to manage the scales, which needs to be done right away, is to apply an imidacloprid drench treatment. Next spring before the trees leaf out, apply a dormant oil. Hopefully this will knock the population down enough that an annual spring application of dormant oil will be enough. If the population is not controlled by next summer, then another application of imidacloprid will need to be made. If the density of scales is low you could pick them off the branches. Local Observations Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu Tomatoes Starry Night acorn squash Watermelon Carrots Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu Swiss chard Basil Magic lily Castor bean Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu Zinnias Verbena Good afternoon! I pray you are well! More rain this past week! We received rainfall 4 days this past week somewhere in the county! Rainfall for Saturday, August 1st ranged from 0.11” near Wapakoneta-Fisher and Townline-Lima roads. Rainfall for Sunday ranged from 0” near St. Rt. 66 and C.R. 66A roads to 0.13” near Tri-Township and Lock Two roads. Rainfall for Monday ranged from 0” at 5 locations to 0.57” near Valley and Idle roads. Rainfall for Tuesday ranged from 0.0” at 7 locations to 0.30” near Fiekert and St. Rt. 385 roads. Rainfall for the week ranged from 0.3” near Santa Fe-New Knoxville and Shelby-Fryburg roads to 1.16” near Fiekert and St. Rt. 385 roads. The average rainfall for the week was 0.67”, 1.72” less than the last newsletter. There is at least a 41% chance of rain Sunday, Monday, Tuesday, and Wednesday, with Wednesday the greatest chance and very low chance of rain for the remainder of next week. Much cooler this week! The average high temperature now is 83 degrees F, one degree F lower than last week. Oh no, we are now headed in the downward direction for temperature! Temperatures were above normal for 0 days and below normal for 7 days this past week. Temperatures ranged from 72 degrees F to 79 degrees F for the week. The average high temperature for the week was 76 degrees F which is a whopping 9 degrees F cooler than last week and 7 degree F cooler than the historical average high. Temperatures will be in the eighties for the next week with Monday being a high of 89 degrees F! Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu The southeastern side of the county received more rain this past week, but the northeast corner is still the driest. I did not water the garden this week. The Moon and Stars watermelon really grew this past week. I have harvested cucumbers, peppers, green beans, and tomatoes since the last newsletter. Early blight continues to spread in the tomato plants and powdery mildew of cucurbits has started this week. Magic Lilies are blooming now. I looked at a paper birch this week and answered how to control crabgrass in the lawn. Weekly Weed Photos Prickly sida Ivyleaf morningglory Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu Waterhemp Smooth groundcherry Special OSU Horticulture Meetings Horticulture Lunch and Learn and Horticulture Happy Hour During this period of COVID-19 OSU Extension is offering a Horticulture Lunch and Learn Program and a Horticulture Happy Hour Program. If you are interested, visit the following web address: http://go.osu.edu/MGVlearn The Lunch and Learn occurs every Tuesday and Thursday from noon to 1:00 PM and the Happy Hour is Wednesdays from 4:00 to 5:00 PM. VegNet Ohio State University Extension Auglaize County Top of Ohio EERA 208 South Blackhoof Street Wapakoneta, OH 45895-1902 419-739-6580 Phone 419-739-6581 Fax www.auglaize.osu.edu Wayne County IPM Notes for July 26 – August 1 August 6, 2020 Vegetable Pests Heavy foliar feeding by flea beetles on a young cole crop transplant. F. Becker photo. Flea beetles continue to be a problem in both young, recently transplanted crucifer crops, as well as cabbage and kale either in harvest or near harvest. Feeding damage from flea beetles on the younger crops can cause stunting and reduced yield. This damage can be especially impactful on heat stressed transplants. The foliar feeding being done on maturing crops can affect the visual appearance of the crop and may result in a less desirable product. In sweetcorn, the European corn borer trap counts have shown some moth activity. A trap in Wayne County had a catch of 22 ECB moths this week.
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