38 REPORT ON INJURIOUS INSECTS FOR 1905. 



or even leaving the trees and crawling to fences, etc. After four- 

 teen or sixteen days the moths of the second brood make their 

 appearance, and the life-cycle is again repeated, the pupal condi- 

 tion continuing through the winter. 



PREVENTIVE AND REMEDIAL MEASURES. 



Picking off the leaves had but very little effect. Spraying 

 with paraffin emulsion in May proved beneficial. There were very 



' - r MBMBBBBBBBl 

 FIG. XXL LEAVES OF LILAC ATTACKED BY LEAF-MINER. 



few blistered leaves on the two sprayed trees, whilst the remaining 

 seven showed little else but blistered ones. 



Spraying with soda and potash in January killed or injured 

 many of the pupae, but as these trees were near a fence, many of 

 the larvae had left the trees and were pupating in crevices and 

 cracks in the fence. 



THE LARCH LEAF-MINER. 



Coleophora laricella, Hiibner. 



The larvae of this moth, and also numerous branches of larch, 

 have been received from Sutton Park; here they have been 

 unusually abundant, and many of the trees had the appearance of 

 having been scorched by a fire. Some trees seemed to be more 

 badly affected than others, but in all cases the injury was con- 

 siderable. 



LIFE-HISTORY. 



. The female moth deposits her eggs in July, a single egg only 

 on each needle. The eggs are of a dull yellow colour, and hatch 



