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FACTORS IN ORCHARD PEST COIITROL 



If a fruit grovrer fails to get as perfect pest control as he had 

 hoped, the chances are that one or more of the folloviing factors, maybe 

 all of them, are responsible. Of these 10 factors, 6 are entirely or al- 

 most entirely the growers' responsibility, 2 are partially so, and 2 are 

 beyond his control. Three factors have to do with the spray program, 3 with 

 pests, and 3 with the orchard, Vfeather is in a class by itself. 



1. Location of orchard (environment, elevation, slope, etc.) 



2. Spacing of trees (crovfded or scattered). 



3. Condition of trees (height, spread, vigor, pruning, etc.). 



4. Prevalence of individual pests, 



5. Supplementary practices (drop disposal, banding, etc.) 



6. Natural enemies. 



7. Vfeather. 



8. Timing of sprays and dusts. 



9. Coverage. 

 10. Materials. • 



Storage Temperature an d Relative Humidity. As the temperature of a stor- 

 age room increases, the higher must be the relative humidity if the rate 

 of v/ater vapor loss from apples is not to increase. At 32°, a relative 

 humidity of 70^^ is as effective in retarding the rate of water loss from 

 apples as one of 80jo at 41°. 



— Lav/rence Southwick 



Wartime Buying of Fruits . A study of retail sales of fruits in metropolitan 

 markets has been made by the Department of Agricultural Economics at Cornell 

 University. The information was furnished by a large Nev; York City chain 

 grocery system and covers the period July, 1941 to June, 1942. In pounds 

 of fruit sold» oranges made up GO.6J0 of the total; apples, 10. 9^^; grapefruit, 

 10.3^j bananas, 7-9°^; lemons, 4.2$^; peaches, 4.2^o. No other fruit was 

 above Z%. Citrus fruits, as a ivhole, took 58 cents out of the average 

 fruit dollar and accounted for m% of the fruit tonnage. 



-- Lawrence Southwick 



Fruit Growing, a Specialized Business . Cbily l/40 of the farms in the United 



States are classified as fruit farms. And yet these farms produce 5/6 of 



the fruit. This suggests the relative^mportance of the farm orchard from 

 the standpoint of fruit production. 



Correctio n. In the December issue of Fruit Note?, under 

 the heading "New Light on V/inter Injury," studies on tree 

 trunk temperatures v/ere erroneously reported as under v/ay 

 in Maine , This work is being conducted at the University 

 of New Hai.ipshire by Mr. Russell Eggert, using the new Mi- 

 cromax recording instrument. 



