1921 ENTOMOLOGICAL SOCIETY. 19 



results as Paris Green, and costs about a quarter as much per pound. Its one 

 disadvantage is its color. Paris Green can be seen in the mixture more easily. 



The mixtures were spread during the first part of the season in the early 

 morning. Later, they were spread almost at any time except in the heat of the 

 day. Bright, sunny, calm days were best. Very poor results were obtained 

 when the mixture was scattered during cold., wet weather. 



The campaign of poisoning continued from the last week in May until 

 about July 23rd. The demand for bait fluctuated very much during that time, 

 but reached it maximum during the week of June 14th to 19th. There were 

 upon record 7,703 applications from farmers for a total of 1,659,100 lbs. 

 of prepared bait during that time. 



Practically every farmer in the grasshopper area reports satisfaction from 

 the use of poisoned baits. Actual counts of dead 'hoppers showed almost 

 incredible numbers in some places. On June 12th on a piece of sod road 

 allowance, an area of one square foot showed 440 dead grasshoppers. An average 

 of eight counts taken in widely separated places showed 1,035 dead 'hoppers 

 per sq. yd. The largest count made was 34 dead to 4 square inches of surface. 

 This figures out to over 53 million dead 'hoppers to the acre. There is absolutely 

 no question about the effectiveness of poisoned baits. 



The following table shows the estimated value of the various crops saved 

 by the use of the poisoned baits : 



Value of Crops Saved By Poisoned Baits, 1920. 



Wheat $10,293,920.00 



Oats 3,900,067.00 



Barley 1,065,370.00 



Eye 574,576.00 



Max 250,755.00 



Total $16,084,688.00 



This estimate only includes that part of the province lying west of range 

 15, and south of township 12. The value of the total crop saved outside of this 

 area is roughly valued at one million dollars, making a total saving of over 

 seventeen million dollars' worth of grain besides a great deal of native grass, etc. 



The ingredients for the poisoned baits used in Manitoba in 1920' cost in the 

 neighborhood of $155,000.00 while the estimated value of the crops saved is 

 $17,084,688.00. This means that for every dollar spent in baits one hundred 

 and ten dollars' worth of crop was saved. From the standpoint of this year's 

 crop alone, it can be seen that the campaign was a success. "What it will mean 

 to subsequent crops, we can only venture an opinion. 



SOME PHASES OF THE PRESENT LOCUST OUTBREAK IN 



MANITOBA. 



Norman Criddle, 

 Dom. Entomological Lab., Treesbank, Man. 



The present locust outbreak in Manitoba is the first that has occurred in 

 those parts with a professional entomologist residing close at hand. It is, there- 

 fore, the first occasion we have had for studying the insects in all their conditions 

 of life. Unfortunately the severity of the outbreak obliged us to devote most 



