Management of Early Leaf Spot of Peanut with Pyraclostrobin as Affected by Rate and Spray Interval

Fig. 4. Effect of rate and application interval of pyraclostrobin (pyr) on final intensity of early leaf spot (ELS) of peanut at (A) Plains, Georgia, and (B) Tifton, Georgia, in 1999 and 2000. The 14-, 21-, and 28-day application intervals for pyraclostrobin are depicted by black, yellow, and blue lines, respectively. At Plains, there was no significant (P > 0.05) rate response of early leaf spot to pyraclostrobin applied on a 14- or 28-day schedule. An asterisk (*) in the graph indicates there was a significant (P < 0.05) linear response to rate of pyraclostrobin. At Tifton, ELS = 4.3 - 0.01*pyr (R2 = 0.29) for the 14-day schedule; and ELS = 7.7 - 0.013*pyr (R2 = 0.18) for the 28-day schedule. There was no significant rate response for pyraclostrobin applied on the 21-day schedule. Vertical red bars represent final leaf spot intensity ratings of nontreated plots; plots treated with 1.26 kg/ha of chlorothalonil (Chl), 227 g/ha of tebuconazole (Teb), or 337 g/ha of azoxystrobin (Azoxy) on 14-, 21-, and 28-day schedules; and block applications of 1.26 kg/ha of chlorothalonil (sprays 1, 2, and 7) and 227 g/ha of tebuconazole (sprays 3 to 6) on a 14-day schedule (Teb block). Vertical red bars do not correspond to rate values on the x-axis. Numbers following the fungicide abbreviations indicate the spray interval in days. There was no year × treatment interaction for either location. Therefore, values listed are the means of two years.



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Management of Early Leaf Spot of Peanut with Pyraclostrobin as Affected by Rate and Spray Interval