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501. Mar. 1923, 34 p. Literature cited: p. 34. 
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A self-mixing dusting machine for applying dry insecticides and fungi¬ 
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A discussion on dusts was led by Mr. Campbell. Among other things 
there arose the question as to when an entomologist should recommend 
control measures. Some differences of opinion developed, but it was 
generally felt that insects with only one or possibly two generations a 
year must be considered differently than those with many generations 
and which develop serious infestations in a few weeks. It was finally 
agreed that the best rule to follow was to consider the infested crop or 
orchard as if owned by the entomologist and make control recommenda¬ 
tions accordingly. 
Meeting adjourned. 
