6 - 



were not sampled. However, in the second year after discontinuation, 

 3% of the fruit were infested with maggot; in the third year, 78% 

 were infected; and in the fourth year 100% were infested with maggot. 

 From then on, the percentage of infested fruit never went below 85% 

 and was normally 100%. Gravenstein was found to be the most suscep- 

 tible variety, and the one most preferred by the maggot. They con- 

 cluded from the study that maggot was the most serious pest in un- 

 sprayed apple orchards. 



In general, it was agreed that areas that needed considerably 

 more research were: 



1) What the natural foods of the flies are in the natural state, 

 and what role these foods play in their reproductive devel- 

 opment. 



2) Migration and dispersal ability of the flies. 



3) Development of a more effective attractant. 



4) The possibility of some type of pheromone produced by either 

 sex, since pheromones are rather common in other members of 

 this group. 



It was agreed upon that this conference would continue to be 

 held annually for several years to come. Dr. Ed Glass of the 

 Geneva Experiment Station was elected chairman of this annual con- 

 ference. 



*************** 



CHEMICAL CONTROL OF SPROUTS AROUND APPLE TREES 



Benjamin L. Rogers 

 University of Maryland Fruit Lab, Hancock 



1 



from t 

 or r i 

 and me 

 ground 

 merely 

 the re 

 among 

 Luce ( 

 be con 

 He sug 

 the br 

 on the 



T 



prouts (s 

 he roots 

 ginate in 

 chanical 

 level as 

 increase 

 maining s 

 rootstock 

 1973. The 

 trolled w 

 gested pr 

 u s h k i 1 1 e 

 exposed 



uckers) un 

 or lower p 



the V i c i n 

 equipment. 



part of t 

 s their nu 

 tubs. The 

 s as wel 1 



Goodfruit 

 ith a brus 

 u n i n g the 

 r mixed 1 

 stubs. Th 



Based on an ar 

 Grower 44( 1 ) : 6 



der apple trees a 

 art of the trunk, 

 ity of roots or t 

 It is necessary 

 he overall prunin 

 mber because shoo 



severity of suck 

 as among rootstoc 



Grower 23:4) rep 

 h killer combinat 

 sprouts in early 

 part to 19 parts 

 e two chemicals i 



re shoots that originate 



They occur naturally 

 runks damaged by rodents 

 to cut these sprouts at 

 g procedure, but this 

 ts develop from buds on 

 ering varies considerably 

 k-scion combinations, 

 orted that sprouts can 

 ion of 2,4-D and 2,4,5-T. 

 March and then applying 

 of heating or spray oil 

 n the brush killer are 



tide originally appearing in The Maryland Fruit 

 -7. 



