- 5 



Much of what I have just said applies generally to pollina- 

 tion in standard orchards as well as to pollination in high den- 

 sity orchards. However, two considerations seem much more criti- 

 cal in high density plantings: 



a. Bee foraging behavior in hedge-type plantings makes it 

 imperative that for optimum results a source of pollen- 

 izer pollen be located in the same row as the main vari- 

 ety. 



b. High populations of honey bees increase the size of work- 

 ing areas of individual bees, thus increasing the likeli- 

 hood of cross pollination and providing coverage of the 

 largest number of blosson]s in the high density orchards. 

 At least 2 good colonies per acre are therefore needed 



to supply the population necessary 

 Suggested References 



Free, J.B. 1960. The pollination of fruit trees. Bee World. 

 41(6 & 7):141-151; 169-186. 



Jaycox, E.R. 1969. Evaluating honey bee colonies for pollination 

 Illinois Univ. Agr. Ext. Serv. Fruit Growing 20 (Rev.). 



1969. Pollen inserts for apple pollination. Illinois 



University Agr. Ext. Serv. Fruit Growing 22. 



1969 



Making and using pollen inserts. Illinois Univ. Agr 



Ext. Serv. Fruit Growing 23 



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



POMOLOGICAL PARAGRAPH 



Weed control - apple orchards. Dr. O.C. Zoebisch of the DuPont 

 Company informs us that the products "Sinbar" Terbacil Weed Killer 

 and "Karmex" Diuron Weed Killer are to be used according to the 

 labels at various rates depending on soil type. Neither one of 

 them should be used in apple orchards on soil types classed as 

 sandy, loamy sand or gravelly, nor where the organic matter is 

 less than 1.0%. 



The use of sand, gravel or quarry chips under the trees for 

 mouse control or weed control creates an environment which, in ac- 

 cordance with the label, disqualifies the orchard for use of these 

 herbi cides . 



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



