EXPERIMENT STATION BULLETINS. Cll 



insect may be controlled by collecting the canes containing (lie eggs and 

 burning them. 



Rasp})erry Gane-'borcr. During June and July these insects appear and 

 work on the new growth a few inches from the end of the canes. The 

 female insect makes two rows of punctures around the cane about one-half 

 inch apart between whicli tlie egg is laid. The girdling causes the tip t(» 

 wilt. The egg hatches and the larva bores down through the pith, usiki ll.\ 

 causing the death of the cane. As soon as the tips in which the eggs are 

 deposited are noticed they should be cut off below the girdle or tunnel and 

 destroyed.' Prompt removal of the canes at the end of the fruiting season 

 will also aid in keeping this insect under control. 



Raspherry Sawfly. A small thick bodied fly which appears in May. The 

 female deposits her eggs between the two layers of the leaf. The young 

 larvae begin to feed as soon as hatched and at first eat out irregular holes 

 and finally the whole leaf. The green larvae may be brushed from the 

 bushes during the heat of the day and will often die before they can get 

 back to the food plant. Spraying with hellebore used a.t the rate of one 

 ounce to one gallon of water is very effective. 



DISEASES 



Approved by the Department of Botany. 



Crown Gall. This is a bacterial disease which occurs on many fruits 

 and is often especially injurious to raspberries. It is easily recognized by 

 the galls or knotty growths which appear at the surface of the soil, or at 

 some distance above the ground on the canes. When making new plant- 

 ings do not set infected nursery stock or take plants from fields Avhere it 

 is known to exist. Kemove old plants which are infected and burn. 



Anthracnose. A serious and common disease of the raspberry, distin- 

 guished by grayish white spots with a purple-colored margin which appear 

 most commonly near the base of the canes. Control : Take out diseased 

 canes at the end of the fruiting season. Practice clean cultivation. May 

 be controlled by spraying with lime-sulphur or Bordeaux mixture. Recent 

 experiments show that it can be most satisfactorily controlled with lime- 

 sulphur. Three applications should be made. First, in the spring before 

 the leaves appear; second, when the new shoots are about six inches high ; 

 third, just before the blossoms appear. For the first application the lime- 

 sulpliur is diluted at the rate of 2^,-2 gallons in 50 and for the later applica- 

 tions at the rate of I14 gallons in 50. For further particulars see Michi- 

 gan Special Bulletin Xo. 88. 



Yelloivs or Gurl. One of the most serious diseases of the red raspberry 

 in Michigan. Cause not known. The plants ai'e stunted, sickly, and Imshy 

 in appearance. Both healthy and diseased plants may occur in the same 

 clump. The leaves are curled and become mottled in appearance. The 

 berries on diseased plants usually become dry before ripening or the}'^ may 

 ripen from ten days to two weeks early. Cannot be controlled by spray- 

 ing. Dig out and burn diseased plants. 



