630 THE MONTHLY BULLETIN. 



INSECT NOTES. 



The rosy apple aphis, Aphis sorbi Kalt. This pest is found to be quite common, 

 though serious only occasionally, this season. There is probably no other aphis that 

 attacks the apple that can do as much mischief as this one. In places it is being kept 

 in check quite well by natural enemies ; in still others they are not sufficiently numerous 

 to control it. This aphis hot only affects the foliage, but the fruit as well, and in 

 certain orchards visited much fruit has been seen that is ill-shapen, has made no 

 growth and can not possibly mature. The leaves are rolled very tightly by this pest, 

 and a spray for its control should be applied early in the season when its first appear- 

 ance is noted". The tobacco preparation, known as Black Leaf "40," is one of the 

 very best sprays to use in controlling it. About 1 part of the Black Leaf "40" to 800 

 to 900 parts of water and a little soap to make it spread and penetrate better is 

 sufficient to kill. 



The Oregon Experiment Station recommends a mixed spray of lime-sulphur and 

 Black Leaf "40." — Geo. P. Weldon. 



The peach twig-borer, Anarsia Uneatella Zell. As early as July 4th at Hanford, 

 Kings County, signs of the twig-borer constructing their little cells or hibernaculae in 

 the crotches of small peach trees were noticed. On July 16th at Hollister, San 

 Benito County, many freshly made mounds of borings were seen in the crotches of 

 peach trees in that section. Some of the hibernating cells were cut into and the 

 larvae found within. Again on July ISth at Hayward, Alameda County, a number of 

 larvas were found in hibernating cells in small crotches of apricot trees. The apricots 

 in a fair-sized orchard showed considerable infestation, and it will probably be neces- 

 sary to spray for its control another season. A spray of lime and sulphur, 1 part to 

 9 of water, if applied thoroughly during the dormant season will give almost perfect 

 results. — Geo. P. Weldon. 



The cherry slug, Caliroa cerasi Linn. The foliage of pear trees is being attacked 

 by this pest in various parts of the State where this fruit is grown. An orchard in 

 Alameda County, which was inspected on July 18th, was found to contain a great 

 many eggs. The tree had been sprayed recently with Paris green and lime in order to 

 control the codling moth. The spray answei-ed a double purpose, for practically all of 

 the cherry slugs were killed also. The eggs hatched well, and the spray could be 

 seen on the leaves where the little larvae had fed for a short time prior to getting a 

 fatal dose of the poison. This pest is one of the easiest to control by means of an 

 arsenical spray, and there is little excuse for the damage that we often see from its 

 attack. — Geo. P. Weldon. 



The mealy plum aphis, Hyalopterus arundinis Fab. This species of aphis is 

 commonly found at this time on plum, prune and apricot trees. Ladybird beetles and 

 other enemies are controlling it quite well in most cases. Its damage is probably 

 over for the season. Another season should it become bad a nictotine spray should 

 be used. — Geo. P. Weldon. 



Jumping oak galls. A. G. Shulz, Horticultural Commissioner of Tulare County, 

 has sent galls from oak trees which look like small eggs and are surprisingly active. 

 They hop about in a most lively fashion. Tlie cause is the larvae of a cynipid gall 

 fly, which are within the galls. — A. J. Cook. 



A small blue and bronze chrysomeiid beetle, Colaspidea varicolor Cr., has done 

 some damage to the foliage of young prime and pear trees in Nevada County. It 

 works upon Ceanathus sp. in the mountains, having also been collected in Placer and 

 El Dorado counties. — B. O. EssiG. 



Bruchus pruininus Horn has been collected feeding upon rose bushes on the Capitoi 

 Park. — E. O. EssiG. 



The harlequin cabbage bug, Murgantiaa histronica Hahn, is very common on 

 cabbage at Chicago Park, Nevada County, Cal., this summer. — E. O. Essig. 



The elm-leaf aphis, Schisoneura rileyl Thos. (S. idmi Riley) has recently been 

 reported by S. H. Essig as occurring on the American elm at Ventura, California. 

 This appears to be the first report of this insect in this State. — E. O. Essig. 



