Some Important Orchard Plant Lick 



21 



For the purpose of making a comparison of the resiihs given 

 in the preceding tables easy, table 5 is submitted. 



■ Table 5 



Summary of Results in Aphis Control Experiment 



, Plot I 



Numbersl 



TREATMENT 



Total number 

 of buds 

 examined 



I & I I Lime-sulfur (i to 9) during dor- 

 I mancy; "Black Leaf 40" (i to 

 1,000). + soap (2 lbs. to 50 gal.) 

 I when buds showed green 



J & 2 I Lime-sulfur (i to 9) during dor- 

 ! mancy; lime-sulfur (i to 9) + 

 I "Black Leaf 40" (i to 1,000) when 

 I buds showed green 



3 & 3 I Lime-sulfur (i to 9) when the buds 

 I showed green 



4 & 4 I Lime-sulfur (i to 9) + "Black Leaf 

 I 40" ( I to 500) when buds showed 

 I green 



5 & 5 ILime-suIfur (i to 9) + "Black Leaf 

 I 40" (i to 1,000) when buds showed 

 I green 



6 & 6 IScalecide (i to 15) while buds were 

 I dormant 



306 



Total number 

 of aphis 

 found 



156 



Number of 

 aphis per 

 100 buds 



6.3 



7 & 7 IScalecide (i to 15) when the buds 

 I showed green I 



A'otc. — Unsprayed trees showed average of 600 aphis per 100 buds. 



.\ large block of trees of the same age and variety in the same orchard were sprayed 

 with lime-sulfur (i to 9) during dormancy. These trees showed an average of 6 aphis 

 to 100 buds. 



Lime-sulfur when applied during dormancy seems greatly to 

 reduce the aphis, causing the number to fall from about 600 

 aphis ])€r 100 buds to 6 aphis to 100 buds. Lime-sulfur when 

 applied in the green-bud stage, after the hatching of the lice, 

 made a much smaller reduction, causing the number t(i fall 

 from 600 per 100 buds to al)out 95 per 100 buds. 



Tlie combination of winter-strength lime-sulfur and "Black 

 Leaf 40" at the rate of 500 to i is more effective than the com- 

 bination at the rate of 1,000 to t, as shown by the fact that the 

 former reduces the aphis to 3 individuals to each 100 buds while 

 the latter left 47 lice to each 100 buds. 



