June, 1921 



BETTER FRUIT 



Page 19 



General Chemical Company's Miscible 

 Oil No. 2. One gallon of oil was used 

 to each 100 gallons of spray. Do not 

 attempt to pour the spray directly into 

 the spray tank. First thoroughly mix 

 the oil emulsion in the container. Re- 

 move the desired amount of oil and add 

 slowly with vigorous stirring, twice the 

 amount of water. The solution should 

 become a milky white emulsion of uni- 

 form consistency throughout without 

 any evidence of free oil or soapy flakes. 

 The emulsion may then be added to the 

 filled spray tank while the agitator is 

 in motion. The tank of spray should be 

 applied at once." 



Glue and soap are also mentioned as 

 available for use as spreaders although 

 the investigators have not found them 

 as desirable for this use as the mater- 

 ials above described. 



the liie of the 



Damage to Prune Trees 

 by Peach Twig Borer 



By W. H. Wicks __ 



Director of Bureau of Plant Industry, De- 

 partment of Agriculture, Boise, Idaho 



INSPECTORS of the Bureau of Plant 

 Industry, state department of agri- 

 culture, began reporting the activities of 

 the peach twig borer in the Emmett 

 valley and the Sunnyslope, Central Cove 

 district of the Snake River district west 

 of Caldwell, as early as the 15th of 

 March this year. As the season ad- 

 vances its activities are noticed in later 

 prune and peach growing sections, 

 where this insect is becoming a serious 

 pest. The majority of the larvae are 

 found at this time still in their hiber- 

 nating quarters, while some have al- 

 ready emerged and are devouring com- 

 pletely the center of buds. The larvae 

 enters the bud either from the side or 

 the terminal end of the bud, feeding 

 downward. The economic loss due to 

 this insect is represented by the large 

 number of buds destroyed between now 

 and blossoming time, causing a reduc- 

 tion of the crop and the killing or de- 

 forming of the twig growth. 



Owing to the extremely small size of 

 the larvae at the time it is damaging 

 the buds and the difficulty in locating 

 its hibernating quarters, much confusion 

 has arisen in regard to the kind of in- 

 sect which has been doing the damage to 

 the buds and twigs, which damage is 

 readily apparent to the fruit growers, 

 but the cause of the damage being diffi- 

 cult to trace. During the past two years 

 the department of agriculture has 

 called attention to the presence of this 

 pest and wishes at this time to again 

 emphasize the necessity of all prune 

 and peach growers searching carefully 

 for this insect. The damage done by 

 this pest is increasing, in fact, there are 

 several orchards which are most severe- 



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ly damaged. A brief description of this 

 insect will aid prune and peach growers 

 to combat the same. 



Description 



THE adult is a dark gray-colored 

 moth with four wings expanded 

 about one-half inch and marked with 

 darker spots (the adult is rarely seen). 



The larvae is about 1-16 inch in length 

 at time of hibernation in the fall and 

 slightly larger at this date. It is the 

 larvae which is destroying buds at this 

 time and burrows down the twigs, usu- 

 ally entering the terminal bud. It is 

 reddish brown with a blackish head and 

 active. When full grown it will meas- 



