116 TIK': MONTHLY BULLETIN. 



INSECT NOTES. 



The adults of the Western twelve-spotted cucumber beetle, Diabrotica soror Lee, 

 were seen In great numDeis hiDernatmg among tlie ury weeiis along a levee in Yolo 

 County. January 10, 1915. During the middle of the day, when the sun was shining, 

 they became quite active. The tarnished plant bug, Lygus pratensis, was common 

 in the same location. — E. J. Branigan. 



The European Grain Aphis, Aphis avenw, is showing up in its usual menacing way 

 on barley in the Imperial Valley. — Harry S. Smith. 



The work of the laurel Psyllid, Trioza alacris, Flor., in Alameda County, has been 

 investigated recently. During the summer season a considerable amount of damage 

 was done by it to the leaves of bay trees, in several sections of the county. On 

 November twenty-flfth some of the worst infested places were examined, and it was 

 found tliat only a few winged lice were present, where earlier in the season the damage 

 from the larvae had been serious. This would seem to indicate that the pest winters 

 in the adult stagie. County Horticultural Commissioner Seulberger and his deputy, 

 Mr. D. P. T. Macdonald, have tried to eradicate this insect in one or two nurseries 

 where its abundance has been the cause of considerable alarm. — Geo. P. Weldon. 



Chrysomphalus dictyospermi, a pest that has proved itself quite a nuisance to the 

 Mediterranean citrus region, has been found in Ventura County. Infestation was 

 confined to a few palms in a greenhouse. Tliese were destroyed. — A. A. Brock. 



The fungus known as Isaria is doing considerable work against the black scale, 

 Saissetia olew Bern., near O.xnard, Cal.- — A. A. Brock. 



Cantaloupe growers are putting forth unusual effort this winter to keep ahead of 

 the aphis. Vines were up and growing nicely early in January. The early melons 

 avoid the aphis and also bring tne long prices. — Harry S. Smith. 



The citrus white fly, Dialeurodes citri. lias again made its appearance in Marysville, 

 and a campaign looking towards its control will be carried on in the near future. The 

 situation is not at all alarming, and it is thought that complete control may be 

 attained by means of spraying. Tliis statement is iustified because of some experi- 

 ments that have been recently conducted with certain oil emulsion sprays, by means 

 of which a very large percentage of the larvae were killed. — Geo. P. Weldon. 



Leptomastix sp., the new parasite of the citrus mealy bug from Italy, has been 

 colonized at Alhambra and in Ventura Covmty during January. — Harry S. Smith. 



