94 



"corn bud worm." Early in July I saw many fields in lower Charles 

 County that had been practically abandoned on account of the attacks 

 of this pest. 



The Hessian fly. — The Hessian fly (Cecidomyia destructor) has 

 been largely responsible for the shortage of the wheat crop in this State 

 this season. Fully one-fourth of the shortage reported is due to this 

 insect. In other words, the losses in Maryland this year from this 

 insect are about $750,000. Many wheat fields in the northern counties 

 were plowed up early this spring and planted to corn. 



The rose bug. — The notorious rose bug (Macrodactylus subspinosus) 

 made its usual appearance this year and did much damage to grapes 

 and peaches. June 8 it was reported to me that this insect had been 

 responsible for the death of a number of young ducks and turkeys. It 

 was stated that the fowls died shortly after eating the insects. 



The boll worm.— The boll worm (Heliothis armiger) has been very 

 abundant in corn, and unusually common in tomato fields, attacking 

 the green as well as the ripe fruit. The injury is especially noticeable 

 in the late crop of tomatoes. 



The grain moth. — Another insect that has been much more common 

 than formerly is the grain moth, Sitotroga cerealella. Its attacks upon 

 corn and wheat in store has been very conspicuous throughout all 

 excepting the three western counties of the State. 



The cabbage plusia. — The cabbage plusia {Plusia brassicce) has 

 been responsible for the entire destruction of many fields of cabbage 

 thisyear. The Harlequin cabbage bug (Murgantia histrionica) has been 

 conspicuously absent in most of the central and northern counties, 

 although it appeared in large numbers early this spring. At the present 

 time I am unable to account for the marked decrease of this pest. 



ON THE LIFE HISTORY OF THRIPS TRITICI. 



By A. L. Quaintance, Lake City, Fla. 

 [Published in Bulletin No. 46, Florida Agricultural Experiment Station.] 



NOTES ON INSECTICIDES. 



By C. L. Marlatt, Washington, D. C. 



The writer has presented at various times before this association the 

 outcome of experiments with different insecticide substances. Without 

 referring to miscellaneous subjects, it is proposed to give now merely 

 a resume of the results so far obtained with pure kerosene, fish-oil 

 soaps, and arsenite of copper (Scheele's green), bringing the records 

 down to date. 



