Combined effects of leaf spot diseases caused by Stemphylium vesicarium (Wallr.) Simmons and Leptosphaerulina trifolii (Rostr.) Petr. on lucerne cultivars, and the efficacy of some fungicidal control methods
1987
Lowe, K.F. | Bowdler, T.M. (Queensland Dept. of Primary Industries, Ipswich (Australia)) | Langdon, P.W. (Queensland Dept. of Primary Industries, Indooroopilly (Australia))
None of the 38 lucerne cultivars tested showed substantial resistance to Stemphylium leaf spot or Leptosphaerulina leaf spot. The level of damage resulting from a severe infection was significantly and positively related to the relative winter activity level of the cultivar. Of the 8 fungicides evaluated, iprodione and propineb were the most effective, reducing the amount of leaf damage relative to the untreated areas. The most effective rate of application was a spray concentration of 0.1 percent product, applied at 300 L per ha. All rates were most effective when applied every 10 days. Although the increase in yield in response to fungicide application was less consistent than that of lesion suppression, up to a 90 percent yield increase over that of untreated areas was measured.
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