6 - 



plants and should not be used until new growth appears. It may 

 not be used more than twice in a growing season. It has been ob- 

 served that temporary injury sometimes occurs when Dacthal* and 

 chloroxuron are applied within a few days of each other during hot 

 weather with temperatures above 85°F. Varieties differ in their 

 susceptibility to this type of injury. 



Dacthal* is very effective for controlling crabgrass and other 

 annual grasses, and most broadleaf weeds except for ragweed and 

 smartweed. It is completely ineffective against galinsoga. Chlor- 

 oxuron complements Dacthal* very well in that it controls most 

 broadleaf weeds including galinsoga, but gives poor control of 

 grasses. 



To keep weeds to a minimum, some growers apply Dacthal* before 

 setting plants and incorporate it, or apply it immediately after 

 setting, before weeds have a chance to germinate. It remains effec- 

 tive for 4 to 6 weeks, then breaks down and weeds begin to appear. 

 At this point, it is advisable to cultivate to get rid of weeds 

 and to loosen the soil to permit runners to root easily. Then, 

 depending on the weed population, either Dacthal* or chloroxuron 

 may be applied immediately after cultivation; or chloroxuron may 

 be applied when weeds emerge; or Dacthal* may be applied immediately 

 after cultivation and be followed by chloroxuron when weeds again 

 appear. 



Dacthal* and chloroxuron may also be used in late summer or 

 early fall to control chickweed and other fall germinating weeds. 

 Dacthal* may be applied following the final side-dressing and cul- 

 tivation in August, followed by chloroxuron in September or October. 

 Or, chloroxuron may be used in September or early October, before 

 the weeds are 2 inches tall (or across, in the case of chickweed). 



Detailed instructions on rates of application, and other in- 

 formation are to be found in the "Small Fruit Weed Control Guide" 

 available from your County Extension Service. 



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



PROMOTION OF FLOWER BUD FORMATION AND FRUIT 

 SET ON NON-BEARING DELICIOUS APPLE TREES 



Duane W. Greene and William J. Lord 

 Department of Plant and Soil Sciences 



Young Delicious apple trees are slow to come into production, 

 so we have been conducting tests on the effectiveness of both mech- 

 anical and chemical techniques for promotion of flowering and 

 fruiting on this variety. 



*Trade name 



