24 UlENNlAL REPORT 



which was slightly infested with this insect. The tree was dug up and 

 burned, and none of the insects have been seen since. It may be counted 

 as good fortune that this insect is so little known in this state. 



THE APPLE APHIS — At present there is no fruit insect so widespread 

 in the state and troublesome to orchardists as this species, commonly known 

 as the green aphis. Nearly every orchard in the state contaias the pest, 

 and in many cases it has been very severe on the trees. Numerous natural 

 enemies have been found feeding on the pest, but they are insufficient to pre- 

 vent it from sometimes becoming very abundant, though they usually hold 

 it in check. 



THE PLUM APHIS — The plum aphis has been found in great numbers 

 in the vicinity of Flathead lake and in Bozeman. 



THE CHERRY APHIS— This insect has been found generally distributed 

 in Flathead county and on a single tree in Bozeman. It is very probable 

 that the insect and the plum aphi^ occur in other places in the state, 

 though not yet recognized. 



'THE CURRANT APHIS— The currant aphis was found in July, 1900, 

 on currant bushes near the Flathead lake. The species is a troublesome one, 

 but may be easily controlled. 



THE OYSTER-SHELL BARK-LOUSE— This insect has been definitely 

 reported only from a few orchards in and near Missoula and Kalispell, 

 but there can be little doubt that it occurs in many other old orchards in 

 Montana. It is said to have become very troublesome in the summer of 1900 

 in an orchard in the Bitter Root valley. This insect need not be looked upon 

 as a very serious menace to the orchards of Montana, since it is easily con- 

 trolled. 



THE PUTNAM SCALE — This insect is a near relative of the San Jose 

 scale, and has been found in a single orchard south of Missoula. The trees 

 affected were not seriously injured, and the presence of the insect in the 

 state need not be looked upon as a very serious matter. 



THE WESTERN PULVIN ARIA— This insect was sent to the Station for 

 determination early in the summer of 1900, having been found occuring in 

 abundance on the shore of Flathead lake. In 1900 it was also received from 

 a gentleman in Dillon. 



THE PEAR-LEAF BLISTER-MITE— The pear-leaf blister-mite is proba- 

 bly the worst pest found, occurring on pear trees in the state. It is gener- 

 ally distributed and quite destructive in the vicinity of Missoula, and has 

 been found near Kalispell. This mite spreads slowly, but is often very se- 

 vere on individual trees. 



THE CLOVER MITE — So far as known to me this mite has not been 

 found by the inspectors of the Board of Horticulture, but in a publication 

 of the United States Department of Agriculture (Marlatt, Circular 19, Sec- 

 ond Series, Division of Entomology, 1897) it is recorded as present in the 

 state. Besides being at times very destructive to clover and the true grass- 



