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Control of eyespot pseudocercosporella herpotrichoides fron. deighton using prochloraz dose and timing



Control of eyespot pseudocercosporella herpotrichoides fron. deighton using prochloraz dose and timing



Tidsskrift for Planteavl 94(2): 233-240



Trials was carried out in winter wheat (1986-88), in order to find the optimal time for control of eyespot (Pseudocercosporella herpotrichoides) using prochloraz (Sportak 45ec). Ten trials with relatively severe eyespot attack were carried out. Prochloraz was applied at three different times in the autumn, at intervals of three weeks after full emergence. These were compared to three different times in spring, starting at GS 12-23 (Zadoks) and finishing at GS 30-31. Prochloraz was compared to a treatment using benomyl (Benlate) at GS 30-31. Autumn control was, in all but one case, found to have kept eyespot in spring at a level below the threshold (15% attacked plants). In July only the application at GS 30-31 was found, on average, to have significantly limited the eyespot attack relative to other treatments. The optimal time of application varied, however, between trials. In all but one trial benomyl gave no or very little effect on eyespot. This was due to eyespot fungus being resistant to benzimidazols. All treatments, apart from the very early spring application and the benomyl treatment, gave significant yield increases. Among the significant yield increases no differences were found. Seven trials in winter wheat and three in winter rye were carried out to find the dose response curve for eyespot treated with prochloraz (450 g, 225 g and 113 g/ha). Control was carried out at GS 30-31. On average a linear dose response curve was found for the three dosages of prochloraz. For comparison, split application with prochloraz (2 .times. 225 g/ha) was tested in spring at GS 12-23 and GS 30-31. A tendency towards better control was found in six out of seven trials when compared to single treatments at full dose. In winter wheat, all treatments, on average, gave significant yield increases. A tendency towards lower yield increases was found with reduced dosages. The relatively low levels of control (on average 46%), when using full dose of prochloraz, does not indicate that a lower dosage generally is advisable. However, the lower effect from reduced dosages did not result in any reduction in net yield. Double dose (900 g/ha), which was tested in only one season, did not indicate a large increase in level of control. The Danish threshold for eyespot is generally low and control has only given small yield increases in most seasons. Therefore, it is suggested that attack between 15-35% can be treated with reduced dosages, if the variety has good resistance to lodging or if a growth regulator is used. Full dose is suggested when more than 35% of the plants are attacked in spring and the variety is not resistant to lodging or a growth regulator is not used.

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Accession: 007159167

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