98 STATE HORTICULTURAL SOCIETY. 



strawberries you are taking a chance on them without irrigation. Irri- 

 gation alone does not do everything — -j-ou follow up with cultivation. 

 One can raise 100 per cent more berries by removing mulch and culti- 

 vating. Also in the orchard you will find that if you keep your orchards 

 irrigated — the same moisture the whole season your crop will be larger. 



I would like to see someone try the irrigation out on a bearing orchard 

 and give us some information on that, as there is a great possibility in 

 that line. 



Question: What does it cost per acre to install this irrigation system? 



Answer: From S250 to $400 per acre? 



Question : What variety of everbearing do you grow? 



Answer: Prolific, mostly. 



DECEMBER 8, 1921. 



AFTERNOON SESSION. 



CONTROL MEASURES OF THE APPLE LEAF ROLLER, GRAPE 

 BERRY MOTH AND OTHER INSECTS. 



PROF. R. H. PETTIT, M.A.C. 



The season just finished has given us opportunity to test out control 

 measures against quite a few capital fruit pests and fortunately progress 

 has been made in our knowledge of control in all cases. 



The season is marked by the worst loss from grape pests in the memory 

 of the writer and first of all as the author of actual damage stands the 

 three banded leaf-hopper, Typhlocyba tricincta. This is a tiny little 

 creature of very active habit, which passes the winter under rubbish and 

 in the shelter of fence corners, fallen leaves, tall weeds and wherever 

 useless material collects and supplies protection from the weather. There 

 is no doubt in the mind of the writer that the destruction by fire of such 

 harboring places during the late fall will finally prove the most effective 

 and perhaps the least expensive means of control for this creature. I 

 know that the job looks to be too big for human accomplishment but a 

 very great deal can be done when we are driven to it. Of course, it must 

 be done by groups of growers. It had best be done by communities, 

 each individual doing his bit for the general good. The writer is fortified 

 in taking this view by the memory of a similar outbreak in the Minne- 

 tonka grape belt of Minnesota and the ultimate success attained as a 

 result of his efforts in finalh' getting surrounding areas cleaned up. 



After the weather begins to moderate and the insects start to stir 

 about they feed on almost any green plant but especially love rasp- 

 berries, strawberries and similar plants. Toward the latter end of 

 May they migrate to the vineyard where they soon mate and commence 

 depositing eggs. During June the young, wingless hoppers become 

 plentiful and by the middle of July, in a normal season, the eggs will 

 have practically all hatched. Just as soon as the eggs have hatched 

 and before the nymphs acquire wings the spray must be applied if the 

 greatest. efficiency is to be reached. 



During the summer of 1921, samples of grape leaves were sent to the 

 writer, daily, by Mr. Eckard, County Agent of Van Buren county, and 

 an attempt was made to put on the first spray at the moment it wheu 



