'Nbw Yokk Agricultukal Experiment Station. 463 



ing, to a depth of two or three inches, where the cocoons are spun 

 in which the transformation to the pupa stage slowly takes place. 

 The transformation is not completed until the following spring. 

 There is but one brood annually. 



Treatment. — If the leaves become spotted as above indicated, 

 they should be examined, and if indications of the eggs or larvae 

 are found they should be sprayed with hellebore, one ounce to the 

 gallon of water, as soon as the young larvae are numerous. Both 

 the upper and under surfaces of the leaves should be covered. 

 Where only a few bushes are infested the insect may be easily 

 checked by brushing the larvae onto the ground about the bushes. 

 If the ground is soft and loose most of the larvae will be unable to 

 return. 



STKAWBEERY DISEASES. 



LEAF-SPOT. 



{SpJiaerella fragariae (Tul.) Sacc.) 

 This disease is also called strawberry " rust " or " leaf-blight." 

 It frequently causes much damage by injuring the foliage so that 

 the plants are incapable of perfecting a full crop of fruit, even 

 though a full crop has set, or as Thaxter states, it also attacks the 

 fruit stems and hulls, " cutting off the supply of nourishment from 

 the berries and disfiguring them by the withering of the calyx." 

 When the spots first appear on the leaves they are of a deep 

 purple color, but later they enlarge and the center becomes gray 

 or nearly white. Portions of the infested leaves frequently assume 

 bright red tints, and when badly diseased finally wither and die. 



Treatment. — Bordeaux mixture, 1-to-ll formula, used as advo- 

 cated by Hunn in the Annual Eeport of this Station for 1892, p. 

 682, gives beneficial results. When setting a new plantation be 

 particular to remove the diseased leaves before taking the plants 

 to the field, or if the plants must be trimmed in the field, the di- 

 seased leaves should not be left where they can communicate the 

 disease to the new foliage as it grows out. The following treat- 

 ment is then suggested : 



