Accumulations of Blitecast DSVs have been low to non-existent. Hancock and more northern locations have not yet reached the threshold of 300 for a recommended initiation of a preventative management program for early blight in potato. Spring Green, Arlington, and Grand Marsh early planted potato fields have reached/surpassed threshold and should receive preventative fungicide applications for early blight management. Accumulations of P-days (recall these are influenced by heat) ramped up this past week and on average we saw roughly 60 P-days across the state of Wisconsin. of Plant Pathology, 60, Email: Lab Website: Įarly blight of potato/tomato. Once these disorders have begun, the return of cooling soil temperature cannot overcome them.Īmanda Gevens, Chair, Professor & Extension Vegetable Pathologist, UW-Madison, Dept. A similar phenomenon is sprouting from buds on the nodes of the stolon, causing competition for nutrients and loss of apical dominance, similar to tuber chaining. The primary tuber can have very low specific gravity and undesirable processing quality. The sizing of the primary tuber is inhibited due to reduced carbohydrates because of competition from the secondary tubers. The physiological cause of this problem is a breakdown of apical dominance of the primary tuber, associated with auxin concentrations basipetal from the primary tuber. Tuber chaining is caused by tuber initiation followed by limited growth of tubers at the nodes of a stolon after the apical tuber at the end of the stolon began to bulk. Tuber chaining on potato tubers potentially caused by heat and drought stress. Tuber chaining may also influence the separation of the primary tubers from the stolons at harvest. For processing varieties, the texture of the fried products and starch content may not be desirable. There is no effect on the fresh market quality of the primary tuber except for reduced tuber size. The small tubers formed would compete with the primary tubers for nutrients and can lower marketable yield. Some folks have reported that they have seen tuber chaining caused by the heat (indicated by the picture on the right) on some susceptible varieties like Silverton. So far, the plants are generally doing well, except for some rainfed seed potato fields in the Antigo area. US drought conditions as of JUS soil moisture anomaly model for the week of June 23-30, 2023 The 10 day future weather forecast shows that it will cool down and we hope that it will alleviate the drought severity. Nationally, the area with abnormal drought to exceptional drought has clearly expanded over the last two weeks, and those regions show substantial predicted soil moisture anomaly. Growers have been irrigating with 0.5’’ – 0.6’’ of water at least every other day to catch up with the rapid growth of the plants and the high daily ET demand. The plot below shows that the daily max temperature exceeded 80☏ again on June 17 th, and ever since then we haven’t had any rain. of Horticulture, 60, Email: though we got some small rain events in the week of June 12 th, it is still really dry all over the Midwest. Yi Wang, Associate Professor & Extension Potato and Vegetable Production Specialist, UW-Madison, Dept. Hancock Highlight Series: spotlighting agricultural research at the UW Hancock ARS with Natasha Paris.Squash vine borer, squash bug, onion thrips.Potato and tomato early blight and late blight disease updates.Potato production updates: effects of high heat and low moisture.
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