A challenge fresh market potato producers have is to produce tubers free from blemishes, because consumers “buy with their eyes” as they naturally gravitate to tubers free from blemishes. Smooth-skinned tubers are especially vulnerable to blemishes. This project conducted a survey to determine the major blemish problems, determined the effects of various chemistries on blemishes, and evaluated the effects of blemishes on newer cultivars. The most prevalent blemishes were skin netting and external bruising. Some fungicides reduced black dot/silver scurf blemishes. Those that were most consistent were Emesto Silver, Quadris, Nubark Mancozeb + Moncot 70 DF and Maxim 4 FS.
Crystal Green is a struvite-based, registered fertilizer. Due to the citrate soluble properties of this mineral, nutrients are only released when in the presence of actively growing roots. Grower trials were conducted in 2015 and 2016 to evaluate the effectiveness of a struvite product, Crystal Green on irrigated Russet Burbank, Umatilla Russet, and Bannock Russet potatoes in Minnesota and North Dakota. In general, there was a positive response to Crystal Green when potatoes were grown in alkaline or acidic soils. Potatoes grown in neutral pH did not have a positive response to Crystal Green.
White mold is one of several important foliar diseases that potentially affect potato production due to reductions in tuber yield and increase disease management costs. This presentation will help potato growers and field managers in potato production regions understand how the fungus that cause white mold colonizes host substrates to initiate disease, infects healthy potato foliage, and is most efficiently managed. Environmental and host factors that affect disease spread and progression will be discussed. The rolls of sclerotia in overwintering of the pathogen, of apothecia and ascospores in disease spread, senescent host tissue for initial infection and how they all relate to disease management will be presented. By the end of the presentation, those that listen will know more about the epidemiology of white mold and will be well equipped to manage the disease.
This presentation gives an overview of the effects of planting canola, dry bean, or wheat prior to potatoes. Data from the first potato crop is available and did not have any significant differences in yield or marketable yield.
The National Potato Council has received a number of calls and other contacts regarding the presence of Dickeya in North America and particularly with regard to the role of laboratory testing in making determinations on the presence of Dickeya in seed potato. Here is some information on these topics. This letter came from the NPC.
Late blight has the potential to be one of the most destructive diseases for potato growers. Late blight is influenced largely by environmental conditions. Management under semi-arid conditions can be quite different than managing the disease under wet, humid conditions. This presentation outlines effective control practices for growers who raise potatoes under semi-arid conditions. This presentation addresses the effect of irrigation on late blight, fungicide efficacy against late blight, the impact of weather, timing of fungicide applications, the effect of application method on fungicide residue, and the role of post-harvest products.
Please let us know your thoughts on topics you would like to hear about during the potato session at the International Crop Expo on February 22-23, 2017 in Grand Forks, ND.
APHIS will provisionally approve qualified private laboratories to conduct pathogen testing of minitubers (Solanum tuberosum) and plant tissues used for the production of minitubers in support of U.S. export certification beginning August 2016. This pilot will allow APHIS to evaluate the use of private laboratory pathogen test results for phytosanitary certification prior to pursuing implementation through rulemaking.
With only 2 trap locations reporting this week and no aphids recovered, this will likely be the last seasonal report for the Aphid Alert Network...
Trap capture numbers remain low as do the PVY Risk Index values. As the season winds down and night time temperatures decrease, we expect this to trend through. Several sites did not report this week and if trap contents come in early next week, we will add them to the report.