Dusting Lowbush Blueberries. 



Dusting lowbush blueberries to control the blueberry fruit fly has be- 

 come a "must'" with growers. The first application of calcium arsenate is 

 applied when 5 percent of the blueberries are blue and should be repeated 

 every 10 days until harvest at the rate of 6-10 lbs. per acre. Many growers 

 are finding it profitable to dust with DDT in the spring before bloom, and 

 immediately following bloom, to control leaf-chewing and leaf-sucking insects. 



W. W. Smith 



Weed Control in Blueberry Fields. 



Most growers are using chemicals for controlling weeds in their blue- 

 berry fields. 2-4-5T with kerosene at the rate of one pint of 2-4-5T to four 

 gallons of kerosene is being used for stump and basal applications. Foliar 

 spray of the Amine forms of 2-4D in concentration of 500 parts per million 

 of 2-4D in water has been found effective on sweet fern and hardhack with- 

 out injuring the blueberry plants. 



W. W. Smith 



Aluminum Wrappers Reflect Heat in Apple Trees. 



The temperature of the cambium layer on the south side of apple tree 

 trunks exposed to direct sunlight in winter has been shown to reach 70° to 

 80°F. on days when air temperature was only 32°F. Wrapping the trunks 

 of the trees with alumnium foil and painting them white are practices that 

 have reduced greatly the absorption of heat at that season. In order to de- 

 termine whether this practice will prevent winter injury, a large number of 

 tree trunks are being wrapped with alumnium foil each fall to determine 

 whether cooling the trunk will harden it, thus preventing crown splitting, 

 as well as direct injury during winter caused by rapid changes in trunk 

 temperature. 



R. Eggert 



Rootstocks for Apple Trees. 



After several years of experimenting with rootstocks and interstocks, it 

 is now determined that Robusta No. 5 on its own root is the most promising 

 body stock we have for apples in New Hampshire. Mailing 1 appears to be 

 the most promising as a semi-dwarfing root for our varieties. Mailing 7 

 has not been tested thoroughly, but it also looks promising. Mailing 9 seems 

 to be most suited for ornamental and backyard trees. 



W. W. Smith 



A New Pot Plant for Florists. 



The tall dark yellow pot calla lily (Z. elliottiana) has taken on a "new 

 look" at the University of New Hampshire. When hybridized with the tiny, 

 pink-flowered, strap-leaved calla (Z. rehmanii) , three new types have been 

 produced. These are low-growing, making good pot plants. One has attrac- 

 tive arrow-shaped leaves and small white flowers. Another has dark green 

 leaves with white spots and attractive pale yellow flowers. The third has 

 small pinkish yellow flowers and dull green leaves. Further variations are 

 expected among the offspring of these hybrid callas. 



E. B. RlSLEY 



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