2S2 STATE BOARD OF AGRICULTURE. 



SUMMARY OF RESULTS. 



Morrice — Tlie foliage of the dusted trees in the Morrice orchard was 

 ill better condition than of tlie spiayed trees. There was no injury and 

 very Uttle seal). The lime sulphur and lead arsenate spraj^ caused a 

 little foliage injury but much less than the lime sulphur and calcium 

 arsenate. 



The dusting gave slightl}' better control than the sprays but the amount 

 was so small in every case that the only inference that could be drawn was 

 that the dust was equally efficient. 



Muir — The foliage of the dusted trees at IMuii' was in nearly perfect 

 physical condition during the entire season. There was no scab on the 

 foliage. The combination of lime sulphur and lead arsenate caused some 

 foliage injury. This was not serious. The combination of lime sulphur 

 and calcium arsenate caused severe burning of the foliage. This was much 

 Avorse than on trees sprayed with lime sul]ihur and lead arsenate. The 

 dusting work in this orchard has been unifonnh' successful during the past 

 three seasons. 



Belding Foliage — On dusted trees there was a very small amount of 

 scab on the leaves and no spray injury. On sprayed trees there was no 

 scab but a small amount of spray injury. On the check tree there was 

 some scab but not enough to prove serious. 



Fruit — The fruit from four dusted, four sprayed and one check tree was 

 sorted and counted. 



On the sprayed trees there was nearly six percent more scal)by fruit 

 than on the dusted trees, there being but one and seven-tenths percent 

 of scabby fruit on the dusted trees. 



The check trees developed a sufficient amount of scab to prove the 

 comparatively values of these methods of scab control. There was 

 practically no insect injury even on the check trees. 



Grand Ledge — No conclusion can be drawn from this test of the relative 

 value of using a larger amount of the Dry L-S Powder as the scab did not 

 develop sufficiently on the checks. A test was made of the lime-sulphur 

 and calcium arsenate poison comparing it to the lime-sulphur and load 

 arsenate in controlling the codling moth worm and other insects. In 

 most of tests with arsenate of calcium we have had more or less foliage 

 injury; otherwise, the calcium arsenate has apparently been as efficient. 



DUSTING CUCUMBERS AND SQUASH TO CONTROL APHIDS. 



It has been found desirable to ascertain the effectiveness of dusts in 

 controlling the insects and diseases of ground crops such as squash and 

 cucumbers. The following is a report on this subject. 



Materials. A mixture secured from the Niagara Sprayer Company and 

 designated by them as "Niagara Contact Special Dusting Mixture" was 

 used. The analysis given by them was: 



Active Ingredients: 



Sulphur— not less than 49 . 00% 



Nicotine — not less than 25% 



Inert Ingredients 50.75 



/c 



100.00% 



