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dbm outbreaks have become more frequent and severe in recent years, particularly in areas and seasons with mild winters... during flowering and pod formation if average numbers of 50 or more larvae per 10-sweeps are found (and the numbers fail to decline after seven to 12 days) spraying should be considered... When crops are at late-flowering and most pods are formed the average number of dbm larvae needs to exceed 100 larvae per 10-sweeps to warrant spraying...
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