THE MONTHLY BULLETIN. 288 



The Hop Aphis. 



Amono- the several insects attaeking the hop vine the hop aphis is 

 one of the more important. It is a pale yellowish p'reen plant louse, 

 and injures the erop by suekinji' out the sap from the plant and by 

 secreting a honey dew it furnishes a medium for the black smut fungus. 

 The cone scales are covered with the honey dew and soon after the 

 black smut fungus spreads over the surfaces, consequently making the 

 hops undersized and of little value. The formula recommended by 

 W. B. Parker in Bulletin 111 of the U. S. Bureau of Entomology, is as 

 follows: "Black Leaf 40" 1 part to 2000 parts of water; flour paste, 

 4 gallons to each 100 gallons of the .spray. 



Oidy those aphids M'hich are hit by the spray material will be 

 destroyed, and therefore the application should be very thorough. In 

 spraying for the hop aphis a type of nozzle giving a coarse spray .should 

 be used in preference to that throwing a fine misty spray, particularly 

 if the men are inexperienced in spraying. 



The Red Spider on Hops. 



The red spider attacks the hoj) vine as well as the deciduous fruit 

 trees, and is regarded as an important pe.st. The infested leaves soon 

 turn yellow and drop and the vines do not produce a normal crop of 

 liops. 



The spray recommended by W. B. Parker of tJie U. S. Bureau of 

 Entomology, consists of flour paste, 8 gallons to 100 gallons of water. 

 The Hour pa.ste is made by mixing a cheap grade of wheat flour with 

 cold water, forming a thin batter, in the proportions of one pound of 

 fiour to one gallon of water ; cook until a pa.ste forms ; use in the above 

 proportions. If the paste is overcooked it will harden when cool and 

 will not mix with the water very readily. 



Lemon Gummosis. 



Gummosis of the lemon is caused by two fungi — the gray fungus and 

 the brown rot fungus — both of which cause the fruit to rot in the citrus 

 orchard and in the packing house. H. S. Fawcett, in No. 8, Volume II 

 of The Monthly Bulletin, states that the gray fungus causes the killing 

 of the outer layer of bark much in advance of the inner, in which there 

 is some softening of the bark. The brown I'ot fungus, on the other 

 hand, causes the killing of the inner bark to lag slightly behind that 

 of the outer, and in which the bark remains hard as the area of infection 

 enlarges. 



The best treatment in the case of the gray fungus is to scrape off 

 the outer dead l)ark an inch or two beyond the line of visible infection 

 and paint the entire trunk with Bordeaux paste. In treating for the 

 brown rot gunnnosis cut out the bark an inch or so beyond the dis- 

 colored line before applying the mixture. The under surface is thus 

 covered with the fungicide. If the diseased areas are treated before 



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