216 THE MONTHLY BULLETIN. 



MISCELLANEOUS INSECTS. 



The Grape Leaf Hopper. 



The adult grape leaf hopper is about t'o i^ich in length, pale j^ellow in 

 color and marked witli red in an irregular pattern. 



According to Quayle, the grape leaf hopper is at the present time 

 probably the most important insect pest of the grape in California. 

 Leaves first infested with the leaf hoppers have a mottled appearance 

 of gray and green, and later turn yellow and brown, finally dropping 

 from the vine. Due to this loss of foliage, the berries do not mature 

 properly, and also the canes are prevented from ripening sufficiently 

 for the next year 's wood. 



This insect is injurious in the Sacramento, San Joaquin and Imperial 

 valleys. The young hoppers of the first generation, according to 

 Quayle, begin to appear about May first, being later in the Lodi and 

 Stockton section, the young of the second generation appearing during 

 the latter part of June. Apparently there are two generations of this 

 hopper in a year. 



The adult hoppers are practically resistant to spraying, while on 

 the other hand the young are readily destroyed by a thorough applica- 

 tion of the following insecticide : 



Black leaf 40 1 pint 



Liquid soap J gallon 



(Or hard soap) 2 pounds 



Water 200 gallons 



Use a high pressure and thoroughly drench the vines, especially the 

 undersides of the leaves. 



The Rose Aphis. 



At this time of the year the pinkish or greenish plant lice clustered 

 on the young shoots and buds of the rose bushes are very numerous 

 and are known to practically every one. 



The best spray to use against these insects is "Black Leaf 40," 1-1000, 

 with a small amount of soap to make the material spread more easily. 

 This same spray will destroy many of the leaf rolling larvae, which eat 

 into the buds and curl the leaves. 



The Grape Root Worm. 



The grape root worm is said to occur throughout the northern and 

 central parts of the State. It is injurious to the growing parts of the 

 grapevine, the larvse feeding on the roots, while the adults, which 

 are small black or greenish beetles, eat chain-like strips from the 

 leaves or the shoots. These appear during the last of April, and into 

 May and June. They are fairly well combated in this stage by a 

 spray of 5 pounds of arsenate of lead to 50 gallons of water. Apply 

 the spray as soon as the beetles appear. Repeat the application when- 

 ever necessary. 



The Harlequin Cabbage Bug-. 



The harlequin cabbage bug is so well known as to hardly warrant 

 a description of it here, except to say that it is a black and bright red 

 sucking plant bug, about f inch in length. The bugs pierce the 



