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Posted on: April 20, 2017 by Rich Guggenheim
Chemical control of Bur Buttercup (Ceratocephala testiculata) can be effective when weeds are extremely young. Mowing and burning is an effective cultural control as is hand pulling. The weed is now beginning to reach flowering and has entered the reproductive state. Bur Buttercup is also toxic to livestock. Always follow label instructions. Rotating pesticide mode of action can reduce the occurrence of pesticide resistance.
Red band needle blight
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Dothistroma Mycosphaerella pini
Posted on: April 6, 2017 by Rich Guggenheim
Red Band Needle Blight of pines is caused by Mycosphaerella pini. Austrian pines are most susceptible, followed by ponderosa and mugo pines.
Symptoms include brown needles (often the base of needles remain green), premature needle drop, loss of vigor, and a slow decline. Needle injury may resembling winter injury or scorch, however, diseased needles will also show gumming and sometimes broken tips that are an ashy-gray color. In addition, dothistroma infections usually occur on the lower and/or inner branches, where moisture is greatest.
Infections occur anywhere on a needle, leaving a “red band” (another name for this disease). The disease often works its way from the bottom of the tree up. In spring and early summer, an infected tree will have brown interior needles, and infections on the current season’s needles will not show browning until fall.
For severely infested trees, fungicide treatments should be applied soon, before budbreak. In Utah’s dry climate, infection rarely gets to the point of necessitating chemical treatment, however.
Treatment: Although infections can occur throughout the season, only spring treatments of fungicide (when necessary) are necessary. Three applications of either copper hydroxide (Kocide), copper hydroxide+mancozeb (Junction, Mankocide), or other copper (Bonide, Camelot) may be necessary, starting at budbreak and twice again at 10- to 14-day intervals.