22 REPORT ON INJURIOUS INSECTS FOR 1906. 



the winter, and when full-fed it leaves the gall, and in the earth makes 

 a cocoon consisting of an internal gummy-like substance, surrounded 

 by particles of earth. It remains in the pupal stage about eight weeks. 

 In the early part of the year this life-cycle takes place on such 

 cruciferous plants as Charlock, and later on the cabbage and turnip. 



PREVENTIVE AND REMEDIAL MEASURES. 



Charlock and all cruciferous weeds should be destroyed. 



All infected cabbage stalks should be burnt, instead of being 

 allowed to rot in heaps or buried in the ground. In both cases the 

 propagation of this pest is favoured, for the larvae make their way 

 from the galls into the earth, where they pupate, and later the beetles 

 emerge ready to infect a new crop. 



THE CURRANT CLEARWING MOTH. 



Sesia tipuliformis, Linn. 



In both Currant and Gooseberry stems, but particularly in the 

 former, the larvae of this moth has been received from Warwickshire, 

 Leicestershire, and Worcestershire. 



An account of the life-history was given in my Report for 1904, 

 so that it !s only necessary to here repeat what was said respecting 

 preventive and remedial measures. 



Whenever the leaves of a Currant or Gooseberry tree commence 

 to wither, and the shoots to die, for no apparent reason, the larvae 

 of this moth are in all probability present, and, if found, the tree 

 should be closely pruned and all the cuttings burnt. 



Cuttings should always be carefully examined for any signs of 

 the moth before planting. 



I am informed that if the trees are well dusted with soot and lime 

 in equal parts, in May and June, the moths will not lay their eggs 

 on such. 



Some trees which I have under observation, and upon which a 

 number of experiments have been made, I hope to report upon at a 

 later date. 



THE HORNET CLEARWING MOTH. 

 Sesia apiformis, Fabr. 



Two cases of serious injury to Alder, and one to Poplar, have been 

 reported upon during the past season. 



LIFE-HISTORY. 



The female moth appears in June, and early in July she deposits 

 her eggs in cracks in the bark of Alder and Poplar on the lower parts 



