43 



The best results of orchard futnig-ation obtained by my parties 

 are shown by the inspection reports on places 5, 6, 7, and 8 in the 

 Sparta district, and 3, 4, 7, and 12 at Richview. In the four 

 Sparta orchards, where 317 trees were sprayed in the fall of 1899, 

 tbe scale could be found on only 11 of them in September, 1900; 

 an*: in the first three Richview orchards, where 148 trees were 

 treated, only seven proved to be infested two years later. At Sparta 

 Nc. 8 a close approximation seems to have been made to a complete 

 extermination of the scale and the same may be said of Richview 

 No. 7, and perhaps, also, of No. 12. 



The most serious obstacle to work was that offered by cold 

 and freezing- weather, as is shown especially by No. 10 at Sparta 

 and No. 1 at Richview, High winds were less disadvantageous 

 (see Nos. 3 and 8 of the Sparta district), and excellent results may 

 be obtained in spite of them, as shown especially by No. 8. Nei- 

 ther snow nor wet weather diminished noticeably the effectiveness 

 of the operation, as shown by No. 11 at Sparta and No. 2 at Rich- 

 view. It would appear from Sparta No. 6 that large trees can be 

 fumigated effectively by the use of two tents at once, overlapping- 

 by their edg-es. 



In none of the cases here described was even a single orchard 

 completely cleared of the scale, — unless possibly at Sparta No. 7, — 

 a fact which taken in connection with the costliness of fumigation 

 as compared with other equally if not more effective methods puts 

 it completely out of the field for ordinary orchard work in Illinois. 



Cost op^ Okchakd Fumigation. 

 The expenses of our work are divisible roug-hly into those for 

 exploration and inspection of the infested territory, for equipment, 

 for transportation of the outfit and party from place to place, for 

 supervision and general manag-ement, and for the operation of 

 fumigation itself. All except the last of these were so largely 

 special to our undertaking and so little like those of the ordinary 

 owner of an orchard that they would be of little or no practical in- 

 terest. For the g-reat variety of trees on which we had to work in 

 fumigating everything- in an extensive district, we needed a 

 g-reater variety and a larger number of tents than would usually 

 be necessary in private work, and the cost of extensive inspection 

 and that of transportation would be avoided by the orchardist 

 working only on his own premises. The expenses of actual fumi- 

 gation, however, would be about the same ordinarily as in our 

 work, provided that the private owner had to hire all his labor but 

 made no charge for his own services, and this item of our account 

 will consequently be useful for comparison. It must be remem- 



