![]() ![]() Cuprofix Ultra 40 Disperss at 0.75 to 3 lb/A on 7- to 10-day intervals.Cueva at 0.5 to 2 gal/100 gal water on 7- to 10-day intervals.Suppresses Colorado potato beetle populations. Champ Formula 2 Flowable at 0.66 to 2.66 pints/A on 5- to 10-day intervals starting when the plants are 6-inches high.Badge SC at 1 to 4 pints/A on 5-day intervals.Care must be taken to avoid build-up in the soil. ![]() Copper products (Group M1) are registered.Ridomil Gold Bravo SC (Group 4 + M5) at 2.5 pints/A, no later than row closure.Echo 90 DF at 0.625 to 1.25 lb/A on 5- to 10-day intervals.Echo 720 at 0.75 to 1.5 pints/A on 5- to 10-day intervals.Bravo Ultrex at 0.7 to 1.36 lb/A or Bravo Weather Stik at 0.75 to 1.5 pints/A on 7- to 10-day intervals.Bonide Fung-onil is available for home gardens.Chlorothalonil products (Group M5) such as:.Bordeaux 8-8-100 gives adequate control in the home garden if applied regularly.In perennial areas, spray at 10- to 12-day intervals from mid-July to mid-August. Idaho-research in eastern and southeastern Idaho indicates foliar sprays are effective when blight lesions appear above the lower third of the plant in nonperennial blight areas. Late-season infection due to reduced soil fertility and a changing environment more favorable for the fungus in the Columbia Basin can result in moderate to extensive infection in many varieties grown, and can cause yield reductions. Oregon-3 years of chemical-control experiments in Klamath Falls and central Oregon showed no increase in 'Russet Burbank' yield. Store tubers under conditions that promote rapid suberization.Handle tubers carefully to avoid bruising.Harvest only when tubers are fully mature.High soil fertility reduces disease severity.Also, avoid open lenticels by timing the end of irrigation. Avoid irrigation in cool, cloudy periods. Sprinkler irrigation should allow foliage to dry rapidly after irrigation.Underlying tissue shows a brown, corky, dry rot more than 0.12 inch deep. The margin between diseased and healthy tubers is usually quite well defined. Tuber lesions are sunken spots, brown to black, from 0.12 inch to 0.37 inch in diameter, and normally circular. Tuber infection is less frequent than leaf infection. If spots are numerous, they kill leaves and consequently may reduce yield. Lowest, oldest leaves are infected first, and they droop and dry as the disease progresses. There usually is a narrow chlorotic zone around the spot, which fades into the normal green. Symptoms First, oval or angular dark brown to black "target" spots appear on leaflets. Alternaria alternata can sometimes be found in leaf and stem spot outbreaks. Reduced fertility often is associated with infection. The disease is found primarily under sprinkler irrigation. Heavy dews and frequent rains seem essential for severe outbreaks. Potato ( Solanum tuberosum) - Brown Spot and Black PitĬause Alternaria solani, a fungus that overwinters as viable mycelium and spores in infected crop residue. ![]()
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