76 



THE REPORT OF THE 



No. 33 



In obtaining the 1923 records, the five nearest fields to a definite "cross- 

 road" point were examined. One hundred stalks were examined from three 

 different parts of the field, in the case of the records from the three circles. One 

 thousand stalks were examined from various parts of the fields concerned at the 

 several points in the other counties. The following is a summary of the condi- 

 tions noted: 



Area 



Highest 

 Per Cent. 

 Infestation 



Lowest 

 Per Cent. 

 Infestation 



Average 

 Per Cent. 

 Infestation 



Total 



Fields 



Examined 



Circle No. 1 (6-8 miles from Union) 



Circle No. 2(15 miles from Union) .' 



Circle No. 3 (30 miles from Union) 



Essex County (80-110 miles from Union) .. . 

 Huron County (50-70 miles from Union) . . . 

 Lincoln County (95-115 miles from Union) . 



Norfolk, east (45 miles from Union) 



Oxford (40-45 miles from Union) 



Perth (50-60 miles from Union) 



Welland (95-115 miles from Union) 



68.0 

 47.0 



7.66 

 13.66 

 1.4 

 0.6 

 1.2 

 2.8 

 1.3 

 4.4 



4.33 



0. 



0. 



0. 



0. 



0. 



0. 



0. 



0.1 



0. 



30.16 

 16.97 

 1.93 

 1.31 

 0.30 

 0.20 

 0.32 

 0.93 

 0.57 

 1.06 



55 

 80 

 135 

 48 

 12 

 15 

 5 

 15 

 10 

 45 



Note. — Mileage stated represents distance from centre of infestation. Welland county first 

 found infested in 1920 and apparently a separate infestation. 



In comparing this season's records of circle No. 3 with those of last year, a 

 very marked increase is evident, especially in a north and northeast direction 

 and in the districts near the lake on both of the eastern and western edges. The 

 increase, in the outside circle, is also demonstrated by the fact that the average 

 infestation in the 135 fields in the outside circle is now 1.93 per cent., whereas 

 two and three years ago, our inspectors had to search the majority of the field 

 in most cases to find an infested stalk. 



This season, 1923, a careful consecutive field examination, chiefly in the 

 counties of Elgin and Middlesex, has been carried on under the direction of 

 Professor Caesar, Provincial Entomologist of Ontario. Records were taken 

 from every field along the main road running south to north between Union and 

 Lucan, a distance of thirty-five miles, and also west to east between St. Thomas 

 and Delhi, a distance of thirty-six miles. The following is a summary of the 

 results: 



District 



Distance 

 Miles 



Average 

 Per Cent. 

 Infestation 



No. Fields 

 Inspected 



North and South — 



Union — St. Thomas 



5 

 5 

 5 

 5 



5 



5 

 6-7 



5 

 6 

 8 

 8 

 5 

 5 



25.9 



26.2 



18.3 



21.5 



20.8 



6.1 



1.6 



1.6 



25.9 

 26.5 

 19.1 

 12.8 

 2.1 

 1.6 



30 



St. Thomas — north 



26 



St. Thomas — north 5-10 miles 



22 



St. Thomas — north 10-15 (London) 



16 



Vicinity of London 



16 



London — north 



20 



London — north 5-10 miles 



9 



London — north 10-16 miles 



East and West — 



St. Thomas — New Sarum 



8 

 18 



New Sarum — Aylmer 



31 



Aylmer — east 



36 



East to Tillsonburg 



6 



Tillsonburg — east 



East to Delhi 



10 

 12 







