INSECT NOTES FOR IQ2I-22 7 
Our experimental work has shown that spraying with arsenate 
of lead at the usual rate about the middle of July and again the first 
week in August, if the insect is abundant, will control the pest. These 
sprayings of course are in addition to the regular sprayings, the last 
of which is usually given the third or fourth week of June. 
Oyster Shell Scale (Lepidosaphes ulmi Linn.) 
The oyster shell scale is becoming more and more abundant in 
southern Minnesota. Several orchards were studied in 1922 which 
were badly injured by this pest. Some owners are taking vigorous 
steps to control the insect. The dormant lime-sulphur spray applied 
as late as possible in the spring, or a miscible oil, will soon put ihe 
insect under control. 
Asparagus Beetle (Crioceris asparagi Linn.) 
The asparagus beetle, found for the first time in the state in 1919, 
continued to spread. In 1922 it was found in the valley of the Missis- 
sippi, having spread from the St. Croix where it was first found. 
Several other insects were unusually abundant in 1922. The 
American sawfly (Cimbex americana Leach) and the red-necked cane 
borer (Agrilus ruficollis Fab.) were plentiful at Lakeland. The phlox 
bug (Lopidea davisi Knight) is proving a serious pest in two different 
localities, Mantorville and Winona, in southern Minnesota, and the 
plum gouger (Anthonomus scutellaris Lec.) was reported very com- 
mon at-La Crescent. A new record for the dark apple red bug ( Hetero- 
cordylus malinus Reut. was obtained in 1922. It is possible that this 
may prove one of the serious recent introductions. + 
Spruce Budworm (Harmologa fumiferana Clem. ) 
The spruce budworm has continued its destructive work in the 
coniferous forests north of Lake Superior. Investigations concerning 
its activities were carried on and an extension bulletin on the subject 
was published. 
Forest Tent Caterpillar (Malacosoma disstria Hbn.) 
The forest tent caterpillar has been responsible for considerable 
damage in several districts of the state. It was particularly abundant 
in the Lake Park region where considerable areas of hardwoods were 
defoliated. In this region the caterpillars were heavily parasitized and 
the outbreak appears to be on the wane. Apparently this insect is 
becoming increasingly abundant in the aspen forests of the north and 
promises to be an important factor in the forest economy of that regior 
