74 OHIO Experiment station.- bulletin i9d 



RASPBERRY AND BLACKBERRY INSECTS. 

 MARCH. 



Raspberry and blackberry canes are sometimes badly infested 

 with a white scale, Aulacaspis rosae, commonly known as Rose 

 Scale. This insect passes the winter in all stages from egg to adult. 

 Probably no better treatment can be suggested than to cut 

 out all badly infested twigs in spring and burn, and spray the 

 remainder thoroughly with lime-sulfur before the leaves appear. If 

 hatching is vigorous in April, spray with kerosene emulsion diluted 

 with 12 parts of water. 



Scurfy Scale and Oyster Shell Scale, when present, may be 

 sprayed with lime-sulfur in spring before the leaves appear, and in 

 late May with kerosene emulsion if they threaten damage. 



See Winter Manual for these: 



Gouty Gall Beetle, Agrilus ruficollis. 

 Snowy Tree Crickets, Ecanthus sp. 



APRIL AND MAY. 



Bud Moth, Tinetocera ocellana. See page 39. 



The Raspberry Sawfly, Monofhadnus rubi, is a four-winged fly 

 which appears with the unfolding of the leaves. The front part of 

 its body is black, the abdomen dark reddish. The transparent 

 wings are veined with black. The eggs are deposited beneath the 

 skin of the leaf, along the midrib and veins, and hatch into small, 

 whitish slugs which later become of a greenish hue. Spraying with 

 poisons before the fruit is much grown, or with hellebore later, will 

 be effective; or, dust in early morning with hellebore and flour, or 

 with dry-slaked lime. 



The Blackbebcry Crown Borer, Bembeda marginata, does consid- 

 erable damage. After growth starts in the spring, some canes may 

 be found to be dead. In some cases, an examination will reveal at 

 the base of such canes, a 16-legged borer, resembling the peach 

 borer. Many of such canes will be found to have been partially 

 girdled just at the base during the preceding fall, and the pith of 

 the same bored out by the caterpillar. The parent moth is a clear 

 winged insect, quite resembling a brightly colored wasp. The body 

 is black, banded and marked with yellow. The eggs are laid in the 

 fall. The most reliable remedy is to cut out all infested canes as soon 

 as they are discovered and burn, taking care not to allow any of the 

 borers to escape from the canes before they are burned. 



The Pale Brown Byturus or American Raspberry Beetle, By- 

 turus unicolor, appears just as the buds are swelling and eats holes 

 in them, and devours the essential organs of the flowers after they 



