62 THE REPORT OF THE No. 33 



The Squash Bug (Anasa tristis). This bug is usually only destructive in 

 small gardens, but this season it was decidedly troublesome in commercial fields 

 at Vineland. Cucumbers as well as squash and pumpkins were injured. 



The Bumble Flower Beetle {Euphoria inda). The flower beetle was 

 somewhat common again on ripe fruit, and to a greater extent on corn, especially 

 sweet varieties. 



The Zebra Caterpillar (Mamestra picta). This insect occurred in suffi- 

 ciently large numbers on turnips and other plants to be conspicuous. At Aylmer 

 it was responsible for considerable damage to gladioli. 



The European Corn Borer {Pyrausta nubilalis). Discussed elsewhere in 

 this report. 



Miscellaneous Insects 



Grasshoppers. In most parts of the province grasshoppers were of very 

 little importance. At Sudbury, however, the roadside grasshopper (Camnula 

 pellucida) appeared in such large numbers that the crops would have been ruined 

 if timely applications of poisoned bait had not been made under the supervision 

 of Mr. Robicheau, the Agricultural Representative. The poisoned mixture 

 which was applied was prepared according to the formula given in last year's 

 report, and some three and a half tons of white arsenic were used in making it. 



White Grubs. White grubs were destructive in the vicinity of Fonthill. 

 At the Fonthill nurseries, nursery stock, particularly apples and cherries, was 

 severely injured. According to the man in charge, the apples and cherries were 

 planted on clover sod. 



The Blackwalnut Caterpillar (Datana integerrima) . Over most of 

 southwestern Ontario, black walnuts and butternuts were wholly or partially 

 defoliated by this caterpillar. In some cases it is claimed that walnut trees 

 which have been defoliated by the insect several years in succession are dying. 



Spiny Oak Caterpillar {Anisota senatorial) . In southwestern Ontario, 

 from St. Thomas to near Brantford, many oak trees were completely or partially 

 defoliated by this species. 



Lilac Leaf Miner. Lilac leaves severely mined by some insect were re- 

 ceived from several places in Toronto, and also from Newmarket and Guelph. 

 The complaint was made that if this insect increased further it would make the 

 lilacs so unsightly that they would be better removed. The dates on which the 

 leaves were sent in were June 16th, 28th, July 31st and August 10th. The larva 

 was lepidopterous and it is possible that it was the same one as troubled lilacs in 

 England, namely, Gracilaria syringella. 



Columbine Borer (Papaipema purpurifascia) . In the latter part of July 

 complaints were sent in from various sources stating that a large borer, working 

 in the base of the plants, was destroying the columbines. On examination the 

 insect proved to be the above species. It is only rarely that outbreaks of this 

 insect are found in Ontario. Mr. Arthur Gibson reported it as being trouble- 

 some in 1893 and in 1904. 



Iris Borer {Macronoctua onusta). Specimens of iris infested by what we 

 believed to be this insect were received from Windsor and Sombra on July 7th 

 and September 5th, respectively. 



