Quinazolinones mildew

Table 4. SAR Protectant Activity of Halogen-substituted Quinazolinones against Wheat Powdery Mildew ...

Pyridopyrimidinones, quinazolinones and thienopyrimidinones were all evaluated in the field for powdery mildew control on wheat. Field candidates were applied early in the season as protectants (before substantial presence of the disease). Table 6 shows field efficacy of several substituted pyridopyrimidinones. Although highly active in greenhouse tests, these analogs were less effective than standards, e.g. flusilazole, under field conditions with only moderate levels of mildew control observed at 250-125 g/ha. 

Field activity of substituted quinazolinones, which generally had good photostability, is summarized in Table 7. Unlike pyridopyrimidinones, quinazolinones maintained very high activity under field conditions giving outstanding mildew control at 50-125 g/ha. Iodine analogs had optimum... 

Proquinazid continued to provide excellent mildew activity in follow-up field evaluations on cereals, grapes, other fhiits and vegetables at very low application rates. Table 8 shows that iodo quinazolinones also gave outstanding control of powdeiy mildew on grapes when applied at 1 ounce per acre. 

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