148 NUT GROWING 



der shoots are sprayed with ar senate of lead in the 

 proportion of about one pound of the paste to ten 

 gallons of water the beetles are killed. Two spray- 

 ings are necessary, as shown by Dr. Britton, because 

 of there being apparently two broods of weevils, the 

 second brood following about three weeks after the 

 first. Perhaps it is not proper to speak of broods 

 in the sense in which we refer to the subject in con- 

 nection with the larvae of butterflies and moths. 

 The delayed group apparently represents a provision 

 of nature against an accident of weather or other 

 condition injurious to the first group. Nature makes 

 provision against loss of her dear weevils in such a 

 way that some do not emerge from the ground at all 

 during the first season but remain over until the 

 second year, very much as codling moths are pre- 

 served against accidents which would distress the 

 entomologist. Japanese walnuts are so tempting to 

 the walnut weevil that when new shoots start from 

 stocks which have been cut back for grafting pur- 

 poses the weevil may lay eggs as late as August, in 

 order to prevent such good material from going to 

 waste from the weevil's point of view. Some of the 

 saw flies are very destructive to European hazels* 

 The saw-fly larvae may be recognized by their habit 

 of working in a row like a column of soldiers on the 

 margin of a leaf and by the habit of erecting their 

 hinder parts at a sharp angle to the rest of the body 

 when they are disturbed. They are easily destroyed 

 with a spray of arsenate of lead, which need not be 



