90 



Man}' writers have experimented upon the effect of several bands 

 upon the tree. Le Baron gives the following table: 



Table VIII. — Number of larvse caught under bands. 



On a single tree, from July 4 to July 23, the same writer found 110 

 larva? under the top l)and jind 150 under the lower band. 



The author states that the windfalls in ever}' case were left as they 

 fell. In the season of the year when a large number of the wormy 

 apples were on the ground the lower band caught most of the larva?, 

 while during July, when the windfalls caused b}' the first generation 

 had hardly begun to fall, the larger number of larvae were caught bv 

 the upper band. 



Professor Aldrich experimented upon one large tree and five bands. 

 The table made from these experiments is here given. 



Table IX. — Professor Aldrich^ s record of bands on one free. 



Out of a total of 194 larva? about 30 per cent were caught on the 

 u])per l)and, and the lower band caught more than any of the inter- 

 mediate ones. The experiment also shows that in seeking a place for 

 their cocoons the larva? will cross several bands, and as there is no 

 wa}' by which those going up the tree and those going down can be 

 separated, no exact percentages of such can be given. 



Wickson found by carefullv conducted experiments that while 2,704 

 apples and pears were counted from which larva? had escaped, there 

 were only 1,188 under the bands, or 41: per cent. The remaining 56 

 per cent either found other places in which to spin their cocoons or 

 were destroyed 1)}' their enemies. The percentage of larvw caught 

 upon a tree will depend entireW on the condition of the tree. If the 

 tree is free from cracks, holes, and rough l)ark, more larva^ will l)e 

 caught; while if there are other places in which they can spin, fewer 

 of them will go under the bands. 



It has been fully demonstrated that in badly infested orchards of 

 the West only a comparative!}' small percentage of the fruit can be 

 saved by l)ands alone. 



