110 THE REPORT OF THE No. 36 



with a tobacco extract and was almost totally free from the pest. The spraying 

 doubtless helped to bring about this result. 



3. The eggs of Neurocolpus nubilus do not hatch until more than a week 

 after the blossoms drop, or in fact until after the Codling Moth spray has been 

 applied. This was true last year as well as this year. The first nymph seen this 

 year was on June 9th. The two species of Red-bug, Heterocordylus malinus and 

 Lygidea mendax, began to hatch a week or more before the blossoms opened. The 

 most practical time to spray for these latter two is just after the blossoms fall, 

 combining tobacco extract with the Codling Moth spray for the purpose. This date, 

 however, would be worthless against Neurocolpus nubilus as it would still be in 

 the egg stage. Moreover, as we discovered last year, tobacco extract even at three 

 times the usual strength for green aphids is ineffective against this pest; for it 

 merely stupefies the nymphs and they soon recover. A soap solution, such as one 

 pound of Sunlight soap to 10 gallons of rain water was found satisfactory. 



4. The time of the appearance of the adults of the different species this year 

 as observed by us was as follows: 



Hetelrocordylus malinus, June 23rd in the cages, a few a little earlier in the 

 orchard. 



Lygidea mendax, June 29th, 

 Paracalocoris colony July 6th. 

 Neurocolpus nubilus, July 10th. 



5. Apparently Lygus communis, Knight,- n. s., the troublesome False Tar- 

 nished Plant-bug of New York, and Apple Green Bug of Nova Scotia if present 

 in Ontario plays no part, or a very small part, in injuring apples and pears. 

 Lygus invitus occurs almost everywhere, but as shown by Knight does not attack 

 fruit trees. 



Local Pests. 



Melon Aphis {Aphis gossypii) was very abundant and destructive on melon 

 plants in Kent County. 



Beet Leaf-miner (Pegomyia vicina) injured severely the foliage of mangolds 

 north of Brockville. 



Corn Seed-maggot {Pegom.yia fusciccps) nearly destroyed some fields of beans 

 in Prince Edward County. Tho fields had been in sod. 



Zebra Caterpillar {Mamestra picta) was abundant enough on turnips in part 

 of Peel County to be an important pest. 



Hickory Leaf-roller (Eulia juglandana) was very common on hickory trees 

 in some parts of the Niagara district. 



American Tent-caterpillars (Malacosoma americana), though rapidly 

 diminishing in numbers east of Toronto, were very abundant at Oakville and Port 

 Credit, and also in parts of Norfolk and Lambton Counties. 



Blackberry Leaf-miner (Metallus bethunei) attacked in considerable numbers 

 the blackberry foliage at Yineland. 



Pear Slug (Eriocampoides limacina) was conspicuous by its absence in the 

 Grimsby district. 



