574 THE MONTHLY BULLETIN. 



INSECT NOTES. 



Mr William Garden, the la\e county horticultural commissioner of San Joaquin 

 County, reported the bean thrips, Heliothrips fasciatus Pergande, as seriously infesting 

 olives ^i'n one locality in the county. — H. S. Smith. 



The cypress twig borer, Phloesinus cristatus Leeonte, is found to be infesting 

 cypress trees in Sacramento. — ^E. J. Branigan. 



7ns concinmis (Mann.), the lodge pole engraver beetle, is one of the most injurious 

 insects found in Golden Gate Park at San Francisco. The attacl^s are confined 

 largely to Pinus radiata and P. muricata.- — Harold Compere. 



The narcissus bulb fly, Meridon equestris Fab., was found to be doing considerable 

 damage to narcissus bulbs in Sacramento the past month. The bulbs came originally 

 from Santa Cruz County.— E. J. Branigan. 



One of the most important enemies of the coniferous forests at Golden Gate Park, 

 '=!an Francisco is the red turpentine beetle, Dendroctonus valens Leeonte. This beetle 

 tunnels in the' cambium laver of the base of the tree. The trees do not succumb to 

 the attack of this species, except from prolonged attack. — Harold Compere. 



The oak pruner, Elaphidon villosum Fab., was observed to be working on the Maul 

 oak at Sierra Madre. This insect sometimes does much injury to isolated shade trees. 

 Besides the oak. it attacks the hickory, apple and various other fruit and forest trees. 

 The larvffi work in the tips of the twigs, causing them to break and fall to the 

 ground, particularly after a wind storm. Control measures consist in collecting all 

 the fallen twigs and burning them. — E. J. Branigan. 



The Dipteron. Diplosis pini-radiatcr, is a pest of Monterey pines in Golden Gate 

 Park at San Francisco. The larvae of this insect work between the needle sheaths. 

 Twenty years ago this species was so abundant that the trees presented a fire-swept 

 appearance from its attack. TVhen the life history was studied it was found that 

 the larvEe transformed in the soil, and that cultivation would destroy the pupae. This 

 was immediately practiced, and so efficient was this method for control that at this 

 date there is only a slight infestation. This case illustrates how an msect, usually 

 considered to be of no economic importance, can become a serious pest under favor- 

 able conditions. — Harold Compere. 



Triphleps tristicolor White, was observed feeding on the 2-spotted mite in the 

 Capitol Park at Sacramento. — Harold Compere. 



Paratriosa cockerelU (Sulc), a Psyllid attacking a large range of plants, ha.s been 

 found to be injuring Solanum capsicastrum in the Golden Gate Park at San Fran- 

 cisco, and also in the Capitol Park at Sacramento, where it has become a pest 

 necessitating measures of control. — Harold Compere. 



Oligota oviformis Casey, a small Staphyhnid beetle, has been observed feeding on 

 the 2-spotted mite, Tetranychus telarius Linn., at Sacramento. — Harold Compere. 



The ladybirds, Olla ohdominalis (Say), and Cycloneda sanguinea (Linn.), were 

 seen during November feeding in both the adult and the larval stages on the hop 

 aphis, Phorodon humuH (Schrank). — Harold Compere. 



