1914 ENTOMOLOGICAL SOCIETY. 35 



Garden Insects. 



Corn Eoot Aphis, {Aphis maidi-radicis) . Last summer cultivated asters in 

 a Bowmanville garden were very seriously injured by root aphids belonging to the 

 species Aphis maidi-radicis. 



Beet Leaf Miner, {Fegomyia vidua). The work of this maggot on the leaves 

 of beets was very conspicuous during the summer and fall in many Bowmanville 

 gardens. The fly oviposits on the under surface of the leaf: the larva burrows into 

 the tissues and mines just beneath the upper epidermis. When mature, it drops 

 to the ground and transforms in the soil. From casual observations which I made 

 on this fly I am inclined to think that it has several generations each year in 

 Ontario. 



Lecanium corni. During July I came across a number of thimble berry 

 bushes very badly infested with ihis scale. This Lecanium is usually so heavily 

 parasitized that it is seldom serious. Lime sulphur wash, applied after the leaves 

 have dropped and again before the buds have opened in the spring, is an effective 

 remedial measure. 



Miscellaneous. 



Elm Schizoneurans. Some elm trees in Durham county were badly infested 

 last spring with the leaf -curling species Schizoneura lanigera (americana) . 



It will be of interest to note here that during the month of October I secured, 

 on the bark of Ulmus campestris, fall migrants of the other elm leaf aphid S. ulmi 

 (foediens) to which Miss Patch refers in : "A Note on Two Elm Leaf Aphids " — 

 Journal of Economic Entomology, Volume 6, Number 3, 1913. 



Mediterranean Flour Moth, {Ephestia JcuehnieUa). This insect is still 

 imposing a heavy tax on the milling industry and feed trade in Ontario, and it 

 seems to me that the toll is becoming heavier each year. It was particularly trouble- 

 some this autumn in a large feed store in Dun das. When I visited this store, I 

 found all the meal and flour literally alive with caterpillars. The moth had been 

 brought into the building in a shipment of corn meal. 



Undoubtedly where superheating is practicable it is the most effective method 

 of ridding th^ mill or store of this scourge. A temperature above 130 degrees 

 Fahrenheit, maintained for at least ten hours will prove fatal to all the adults, 

 caterpillars and eggs of Ephestia. 



In using the superheating remedy the following precautions are important : 



1. No bags of infested meal or flour should be left on the basement floor, as 

 difficulty is often experienced in raising the temperature of this floor to a fatal 

 point. 



2. Bags of meal or flour should not be superheated when in piles, but each 

 bag should stand separate so that the heated air can circulate freely around it. 



3. Belting and anything else liable to be injured by excessive heat should be 

 removed from the building. 



4. Thermometers registering over 130 degrees Fahrenheit or 50 degrees Centi- 

 grade should be placed in different parts of the building to insure thorough work. 



5. When it is found impossible to maintain a fatal temperature on the base- 

 ment floor, the same should be scalded with hot water to destroy any caterpillars 

 which might have dropped there. 



