14 THE REPOKT OF THE No. 36 



burn and one or two other places in the OttaM^a District. The Carp and Kinburn 

 outbreaks were investigated by me on July 21st, when fields of oats, barley and 

 corn were found to be freely infested. Many hundreds of thousands of the worms 

 were present. The Army-worm outbreak in Canada, however, during the past 

 season is discussed on page 72. 



Locusts. The Migratory Locust (Melanoplus atlanis) was again enormously 

 abundant at Bowesville, near Ottawa, and at several other places in the district. 

 The crops chiefly attacked were those which I mentioned in my report last year, 

 viz., oats, barley, timothy and corn. Eather extensive experiments were con- 

 ducted by the Entomological Branch with the Kansas poison bran formula and 

 other remedies. A brief account of this work is given on page 97. The Kansas 

 formula gave excellent results and we have no hesitation whatever in recommend- 

 ing it. 



Cutworms. These destructive caterpillars were again very abundant through- 

 out the district. The interesting outbreak was that of the Common Striped Cut- 

 worm (Euxoa tessellaia), which was very abundant on the Central Experimental 

 Farm, destroying annual flowering plants, tobacco, etc. The Dark-sided Cutworm 

 {Euxoa hiessoria) , was also numerous and ruined many young plants, particularly 

 vegetables. Tlie Eed-backed Cutworm (Euxoa ochrogaster) was injurious in the 

 district and reports were received of injury to peas, beans, clover, corn, mangels 

 and carrots. The Glassy Cutworm (Hadena devasiairix) was present in numbers 

 in tobacco fields near Ottawa. 



EoOT Maggots. These regularly-occurring insects were again very destruc- 

 tive in eastern Ontario; and a good remedy for the preservation of radishes and 

 onions is still a desideratum. iCabbages and cauliflowers were again protected on 

 the Central Experimental Farm by placing around them at the time of planting 

 out, discs made from tarred felt paper. Wherever they were applied properly 

 excellent results were obtained. 



The Carrot Eust Fly {Pslla rosa). My attention was called to an out- 

 break of this insect in a private garden in Ottawa. At the time of my visit, 

 July 13, the bed of carrots had been completely destroyed, and the tops were wilted 

 and lying on the ground. It is several years since the insect has occurred in- 

 juriously in the Ottawa District. Unfortunately, it is rather difficult to control. 

 When young carrots are being thinned out, the spraying of the remaining plants 

 with ordinary kerosene emulsion, one part in nine of water, has been found useful 

 as a protection against injury by this insect. In the Maritime Provinces, where 

 the insect has also been destructive the past season, some growers found the 

 kerosene emulsion of value. Applications should be made once a week during 

 June and first half of July. 



The Celery Caterpillar (Papilio polyxenes) was more than usually 

 abundant in the district, the chief injury noticed being to parsley in early July. 

 Owing to their conspicuous markings — green with transverse black stripes — they 

 are easily seen, and unless present in extraordinary numbers the remedy of hand- 

 picking is usually all that is necessary. 



The Diamond-back Moth (Plutella inacuUpennis) was very apparent in the 

 latter half of June and its injuries were readily observed in fields of cabbages. 

 It is not a difficult insect to control. Paris green in the ordinary strength (1 

 pound to 160 gallons of water) or arsenate of lead (2 pounds to 40 gallons of 

 water) will control the caterpillars. It is perfectly safe to use either of these 

 arsenites up to a week or two of the time the cabbages are to be used as food. 



