20 



of an early and late sprajing on rows 4 and 5 show an inci'ease of 8 

 per cent of wormy fruit where Bordeaux mixture was added to the 

 first aj^plication, while on rows G and 7, where three sprayings were 

 made, an increase of 11 per cent of wormy fruit occurs where this 

 mixture was added to the first and second spraying. Apjjarently this 

 phase of the treatment is worthy of further trial and consideration, 

 as the results of a single season's work should not be accept(;d as con- 

 clusive evidence that the addition of Bordeaux mixtui-e to poisonous 

 sprat's diminishes their effectiveness. 



On row (j, where no Bordeaux mixture was applied, several trees 

 near the north end were quite badly affected l)y apple scab. The 

 other trees on the same row were only very slightly affected with this 

 disease and to no greater extent than the trees where Bordeaux mix- 

 ture was ai^iilied. • 



The results of the spraying by Mr. Hudson show a favorable increase 

 when compared with the check row. This spraying Avas considerably 

 less successful in holding the insect in check than the treatment that 

 we used with disparene, as will be observed in Table II. This may 

 in part be due to the quality of the poison applied. 



Mr. Gillette stated that he was much interested in the spraying 

 experiments for the control of the codling moth, as he had studied this 

 insect for several years. He had used arsenate of lead recently in 

 Colorado with good results. It was coming into very general use in 

 his State. Pie called attention to the large percentage of wormy fruit 

 on the check row, but stated that he believed that if the check trees 

 had been at a considerable distance from the treated trees the amount 

 of wormy fruit would have been larger. He was inclined to think 

 that many of the fruit growers in Colorado were using too large an 

 amount of lime. 



Doctor Fletcher considered that entomologists should be very care- 

 ful in making recommendations to dispense with Bordeaux mixture 

 when spraying for the codling moth, as, in his experience, it had been 

 exceedingly beneficial in holding several diseases of the apple in 

 check. The "black spot" of the apple causes great loss to the grow- 

 ers in Canada and has been effectually controlled by adding Bordeaux 

 mixture to the spray when treatment was made for the codling moth. 

 He found that its addition usually decreased the effectiveness of the 

 poison a little, but he would not favor leaving it out even if a con- 

 siderably larger per cent of fruit than is the case were found worm}^ 

 as mentioned in the paper under discussion. 



Mr. Gillette i-emarked that he had been able to recognize only two 

 broods of this insect in Colorado, and that where he had made three 

 sprayings he had, in one case, reduced the number of wormj^ apples 

 to 1.6 per cent, while the check block had 31. G per cent wormy. 



