THE MONTHLY BULLETIN. 217 



Grasshoppers. 



The iiuportaiK'c of the i)rob]em of gi-asshopper control can not bo 

 overestimated. l*roteet your young orchard trees by broad tanglefoot 

 l)ands around the trunks near the base. The l)ands must be thick or 

 tlie stronger lioppers will pull out. Poisoned bait placed at the base 

 of the trees will destroy many of them before they are able to ascend 

 the trees. The poisoned bran mash is made as follows : bran 40 pounds, 

 a cheap grade of molasses 2 gallons, arsenic 5 pounds. Stir the molas- 

 ses in with the bran and then add the arsenic. Let stand over night 

 and mix thoroughly ])efore placing in tlie field. Moisten and renew 

 bait as needed. It is advisable for growers whose orchards are sur- 

 rounded by waste lands, which are grasshopper breeding i)laces, to 

 burn them over when the young hoppers are plentiful. This should 

 be done at night for the reason that at that time the young insects are 

 inactive. Spraying a strip of the green crop near the edge of the field 

 where the hoppers are entering with Paris green, one pound to 100 gal- 

 lons of water, or arsenate of lead, 6 pounds to 100 gallons of water, 

 seems to be worthy of trial. It must be remembered that these arsenic 

 compounds are poisonous and care nuist be taken fo keep the stock 

 away from the sprayed plants. 



The Oak Moth. 



The larvffi of the oak moth are often very destructive to the oak in 

 California. They destroy the leaves. Poisoning them by using ar- 

 senate of lead, 5 pounds to 100 gallons of water, will be effective. In 

 s])raying the foliage of large oak trees a strong pressure and tower 

 will ])e almost necessary. 



Hop Aphis. 



To the hop growers the hop aphis is a well-known insect. It is pale 

 yellowish-green in color. According to W. B. Parker^ the hop aphis 

 injures the crop in two ways: by sucking out the juices of the plant 

 and by furnishing a medium for the black smut fungus to grow in. The 

 cone scales covered with the mildew secreted by the hop aphis are soon 

 covered with the black smut fungus injuring their commercial value. 

 The infestation of the hop aphis retards the plant's growth. The 

 formula consisting of black-leaf 40, 1 to 2,000 of water, with flour 

 paste 4 gallons to each hundred gallons of the spray, is effective. It 

 nmst be remembered that Avhen spraying in spring for the hop aphis the 

 aphids nuist be hit by the spray in order that they may be destroyed. 



The Red Spider on Hops. 



The hop red spider is a general feeder on many of our field crops. 

 It is a snuill reddish or greenish-yellow mite and feeds principally on 

 the lower sides of the leaves covering them with a tine web. The yellow 

 spots made by the mites in the leaves soon become very numerous and 

 later the leaves turn yellow and fall. The spray recommended by 

 W. B. Parker of the United States Bureau of Entomology consists of 

 flour paste 8 gallons to 100 gallons of water. The flour paste is made 

 by using a cheap grade of wheat flour with cold water making a thin 

 batter; use one pound of flour to one gallon water, cook until a paste 

 forms ; use in the above proportions. 



'Bull. No. Ill, Bur. Ent, U. S. D. A. 



