354 The Principles of Fruit-growing 



CURRANT-WORM, OF CURRANT and GOOSEBERRY SAW-FLY 



(Pteronus ribesii).- Larva, about % inch long, yellowish 

 green, feeding on leaves of red and white varieties; two to 

 four broods. 



Hellebore, applied early; arsenicals for the early brood. 

 Treatment should begin while the larvae are on the lower- 

 most leaves of the bushes. Before the leaves are fully grown, 

 the holes made by the worms may be seen. The second 

 brood is best destroyed by killing the first brood. 

 FOUR-STRIPED PLANT-BUG (Psecilocapsus lineatus). A bright 

 yellow, black-striped bug about ^ inch long, puncturing the 

 young leaves and shoots of many plants. 



Jar into a dish of kerosene. Kerosene emulsion when 

 the nymphs are young. Cut off the tips of the shoots in early 

 spring to destroy the eggs. 

 Dewberry. See Bramble Fruits. 



Gooseberry. MILDEW (Sphseroiheca m&rs-uvse). A powdery mildew 

 of the fruit and young growth of English varieties. 



Spray with potassium sulfid, one ounce to two gallons of 

 water, at intervals after leaves begin to unfold. 

 GOOSEBERRY FRUIT- WORM (Dakruma convolutella) . Larva about 

 % inch long, greenish or yellowish, feeding in the berry, caus- 

 ing it to ripen prematurely. 



Destroy affected berries. Clean cultivation. Poultry. 

 Grape. BLACK-ROT (Guignardia bidwellii). Brown circular spots 

 on leaves, black, elongated, sunken pits on petioles, canes, etc., 

 and on the berry a brown rot, with shriveling and wrinkling. 



Spray with bordeaux mixture, 4-4-50, before rains. 

 Spray (1) when the third or fourth leaf unfolds; (2) as soon 

 as the blossoms have fallen; (3) when berries are size of a pea; 

 (4) about two weeks later. Two or more applications if wet 



DOWNY MILDEW, or LEAF-BLIGHT (Plasmopara viticold). White 

 frost-like patches on the under side of the leaf. 

 Same as for black-rot. 



GRAPE-CURCULIO (Craponius insequalis}. Larva small, 

 white, with a brownish head. Infests the grape in June and 

 July, causing a little black hole in the skin and a discolora- 

 tion of the berry immediately around it. The adult is a gray- 

 ish brown snout-beetle, about one-tenth inch long. 



