EXPERIMENT STATION BULLETINS. 



317 



Remedies. — The larvae and beetles feeding on the leaves may be readily- 

 killed by the arsenites, but this is of little avail where the beetle is at work 

 in the bud where the arsenites will not reach it, and probably the best 

 thing we can do is to jar the beetles off into a broad pan with a little kero- 

 sene in the bottom or on a stretched cloth well saturated with the same. The 

 vines are closely pruned and cover but little space at the time the beetles 

 appear, so that the whole vineyard can be quickly gone over in this way. 

 The beetles will readily drop, when the weather is a little cool. As a pre- 

 ventive, keep all rubbish picked up, and fallen leaves raked from the ground 

 so that the hibernating beetles will be without protection. Grape vines , 

 growing in grass are much more liable to attack than those that are 

 cultivated. 



LEAF HOPPEES. 



There are several species of leaf 

 hopper that suck the sap from the 

 leaves of the grape until they become 

 speckled, brown, and may even wither 

 and drop off. These leaf hoppers, 

 one of which is shown in the cut, are 

 prettily marked and banded. The 

 most injurious one in Michigan 

 {Typhlocyba tricincta Fitch) is 



Pig. 31.-Grapevine Leaf Hopper I^Eryihrcmeura nearly pure white With three black 



vitis Harr.). bands crossiug it. The individuals 



are about one eighth of an inch long. They work mostly on the under 

 side of the leaves and quickly jump or fly to some other part of the vine 

 when disturbed. 



Remedy. — A spray of kerosene emulsion thrown on the under side of the 

 leaves in the cooler part of the day. 



The rose chafer is very fond of the blossoms and young fruit of the 

 grape. It has already been treated of under insects attacking the peach. 



Climbing cut- worms also attack the fruit and foliage of the grape, but 

 have already been spoken of under the apple insects and the same pre- 

 ventive should apply here. 



For the large caterpillars that are occasionally found on the grape vine 

 leaves, it hardly seems necessary to suggest anything more than hand 

 picking, though the arsenites may be used. 



DISEASE OF THE STRAWBERRY. 



LEAF-BLIGHT (Sphcerella fragarice, Sacc). 



In some seasons this disease proves quite destructive both to plants 

 and the crop. It first appears upon the leaves as reddish-purple spots, 

 which soon turn brown and finally white. Upon these spots one form of 

 spore is developed, which is used to spread the disease during the summer, 

 while in the fall and winter a form is produced which in the spring causes 

 the infection of the new leaves as they are developed. Not only does the 

 disease greatly reduce the leaf area of the plants but, by attacking the fruit 

 stalks and the calyx, it tends to deprive the fruit of its nourishment, which 

 results in its shrivelling, and the entire crop may be ruined. 



