356 



preceding December and January, and partly from those that pupated 

 in May of the preceding year. The second lot of adults appear from 

 the latter part of May to the middle of June, the third from the end 

 of June to the middle of July, and the last in September and 

 October. 



The natural enemies include Chrysopa calif ornica, Coq., which sucks 

 the eggs ; the bug, Zehts renardii, Kol., feeding on young larvae ; 

 Apanteles sp. parasitising the larvae ; and Chalcis ovata, Say, which 

 is apparently the most important and infests the pupae. 



About the middle of May and again in the middle of July the trees 

 should be inspected for the presence of eggs, and as soon as the first 

 ones begin to hatch, the trees should be sprayed. One thorough applica- 

 tion of 6 lb. lead arsenate, 4 U.S. gals, flour paste and 100 U.S. gals, 

 water usually proved sufficient to prevent injury from two broods of 

 larv^ae. The mixture must be constantly agitated whilst spraying. 



\^^^ DuRUz (W. P.). The Cherry Fruit Sawfly and its Control.— MZ/j/y. 



Bull. Cal. Dept. Agric, Sacramento, xi, no. 4, April 1922, pp. 

 393-399, 5 figs. 



Great damage was caused locally in California during 1920 by 

 Hoplocampa cookei, Clarke, which attacks both sweet and sour cherries, 

 plums and prunes, and occasionally apricots and peaches. It will 

 also feed on wild plum and willow. A great deal of the information 

 concerning the life-history of this sawfly is quoted from a paper already 

 noticed \^.A.E., A, i, 178]. Of the various sprays tested, nicotine 

 sulphate in combination with either lime-sulphur or a miscible oil 

 proved the most effective [loc. cit.']. The spray should be applied 

 at the time the blossoms are opening. The destruction of wild plum 

 and willows in the vicinity of infested orchards is also advocated. 



Larson (A. 0.). U.S. Bur. Ent. Field Control o! the common Bean 



Weevil {Bruchus oUectus, Say). — Mthly. Bull. Cal. Dept. 

 Agric, Sacramento, xi, no. 4, April 1922, pp. 400-408, 2 figs. 



From the observations here described it is evident that early beans 

 are more susceptible to injury by Bruchus obfectus, Say, than later 

 ones. Beans grown under varying conditions such as on highland 

 or flooded areas, on sandy or clay soil, either irrigated or unirrigated, 

 are more or less subject to attack only in so far as they are planted 

 earlier, or mature earlier. The beetles show a preference for ovipositing 

 in the earlier and most mature bean pods. They are short-lived, 

 and most of them emerge from the stored beans during the early part 

 of the summer, lay their eggs on early beans and die. Late beans 

 are infested by the beetles emerging from the early beans or from a 

 second generation from the stored beans. Usually this second genera- 

 tion does not emerge until shortly after the early beans have been 

 harvested. 



The spread of the Bruchids from the stored beans to the field should 

 be prevented. Field infestation may also be reduced by planting a 

 trap crop, of the same variety as the main crop, two to four weeks 

 earher than the other beans. The size of the trap crop must be governed 

 by the size of the bean field, two rows near each side and the middle 

 should be sufficient in a large field. The trap crop should be harvested 

 and fumigated before the adults begin to emerge. 



