449 



Jones (P. R.). Machine Gun Work with a new Formula on Red 

 Spiders in Tulare County. — Mthly. Bull. Cal. State Commiss. 

 Hortic, Sacramento, vii, no. 7, July 1918, pp. 455-457. 



Measures against Tetranychus telarius (red spider) are usually 

 carried out by means of sulphur fumes from dry applications, or by 

 contact action from petroleum solutions, soap decoctions, or wet 

 sulphur sprays of either lime-sulphur, atomic sulphur, sodium sulphide 

 or potassium sulphide combinations. Under favourable conditions 

 each of these methods may be efficacious, but in order to obviate the 

 disadvantages arising from their use in any but the most favourable 

 circumstances, the author has been experimenting with the object 

 of obtaining a spray that would combine the advantages of each 

 method without its disadvantages. 



A high pressure of 250 to 275 lb. is necessary for this spray, which 

 should be sufficiently coarse to give it driving power to penetrate 

 the webs of the red spider. The formula that proved most successful 

 was 6 U.S. gals. Orchard brand lime-sulphur solution, 2 U.S. gals. 

 Triumph miscible oil, and 1 lb. ground glue, for a 200 U.S. gal. spray 

 tank. In preparing the spray, 5 lb. of ground glue was thoroughly 

 dissolved in 5 U.S. gals, water. Two U.S. gals. Triumph oil were 

 put in another receptacle and 1 U.S. gal. of the glue solution stirred 

 into the oil. Water was then added and the mixture stirred until 

 5 U.S. gals, of a thin creamy emulsion were obtained. The spray 

 tank was filled with water to which the 6 U.S. gals, lime-sulphur 

 were added. The oil and glue mixture was added just before the 

 spray was used. The results of this spraying were excellent ; from 

 5 to 10 minutes after the spray had dried, thousands of dead mites 

 Avere found on both surfaces of the leaves, and no living individuals 

 were seen. The free sulphur continued to act for a long period on 

 the young hatched from the eggs. 



For general work throughout the State it is probable that 4 U.S. 

 gals, lime sulphur, 1 U.S. gal. oil and 1 lb. glue would be sufficient for 

 a 200-gal. spray tank. It is hoped to carry out further experiments 

 with this formula on trees in fi'uit. * 



Tanaka (Dr. T.). A New Codling Moth attacking the Persimmon in 

 Japan. — Mthly. Bull. Cal. State Commiss. Hortic, Sacramento, 

 vii, no. 7, July 1918, pp. 462-463. 



The larva of the Momphid, Kakiroria flacofasciata, Nagano, causes 

 serious damage to persimmon fruit in Japan. There are two genera- 

 tions of the moth in a season and each larva usualh^ attacks from 

 4 to 6 fruits ; in many cases the crop is ruined by these insects and 

 trees are left without a single fruit. The sweet fruits are particularly 

 liable to attack and should be encased in bags as a protection. 



Severen (H. H. p.). Fruit Flies of Economic Importance in California. 



Mthly. Bull. Cal. State Commiss. Hortic., Sacramento, vii, no. 7, 

 July 1918, p. 464. 



Straussia longipennis, Wied. (sunflower fly) has been several times 

 collected in California. In New York it has been observed ovipositing 



