- 3 - 



3-3/4 to 5 pounds per acre on the area actually sprayed In the early spring. It 

 is most effective when used as a pre-emergence treatment and not as effective on 

 established and growing vegetation. If heavy vegetation is present, Simaztne 

 should be combined with a. label-approved contact killer such as Dalapon. 



5. Simazine plus Dalapon - Apply Dalapon at the rate of 5 to 10 pounds plus 

 3-3/4 to 5 pounds of Simazine per acre on the area treated. The question of 

 whether to use 5 or 10 pounds of Dalapon is the same as that discussed under the 

 heading "Dalapon plus Diuron" . 



6. Amizine - A mixture of Simazine and Amitrol has been cleared for use in 

 bearing apple orchards. The clearance reads as follows: "Apply Amizine in the 

 spring, after weeds emerge but before fruit starts to form . Mix 7 pounds of 

 Amizine ii 100 gallons (1 ounce per gallon) of water. Wet weeds thoroughly^ 

 treating a band at least 3 feet wide around the base of each tree. Assuming 40 

 trees per acre, use about 100 gallons of this spray solution for 30 acres. Do 

 not allow spray to contact stems, foliage, or trunks of these trees," 



Bearing Pear Orchards 



Dalapon, Diuron, or the combination of the two may be used in bearing pear 

 orchards. The recommendations for the use of these materials ^re the same as 

 those given for bearing apple trees. 



Non-Bearing Apple Orchards 



1. Dalapon - May be used for control of grass under non-bearing apple trees 

 at least 4 years old. Additional information on Dalapon regarding rates of 

 application and when to spray is given in the section on bearing apple trees. 



2. Diuron - May be used for control of certain seedling annual weeds. Use 

 only on trees that have been established in the apple orchard for at least 1 year. 

 Do not use under dwarf or semi-dwarf trees. Additional infoirmation on Diuron 

 regarding rates of application and when to spray is given in the section on 

 bearing apple trees. 



• 



3. Dalapon plus Diuron - This combination may be used on non-bearing trees 

 at least 4 years of age. Additional information regarding the use of this com- 

 bination is given in the section on bearing trees. 



4. Simazine - Apply Simazine (80 per cent wettable powder) on trees estab- 

 lished 1 year or more at the rate of 3-3/4 to 5 pounds per acre on the area 

 actually sprayed. Simazine controls both broadleaf weeds and grasses. It is 

 most effective as a pre-emergence herbicide and should be applied just prior to 

 or during weed emergence. This material acts on the roots and its effect on 

 weeds is therefore dependent on rainfall to move the chemical into the root zone. 



Four per cent granules of Simazine are available. Apply these at the rate of 

 50 to 75 pounds per acre. 



5. Simazine plus Dalapon - On non-bearing trees at least 4 years old, 

 Dalapon may be added to the Simazine. The recommendations are the same as for 

 bearing trees. 



