REPORT OF THE SOCIETY 73 



mines between the upper and lower epidermis. This injury to the leaves decreas- 

 es the size of the root crop, and if grown for seed, the quantity of seed produced 

 is often materially lessened by the partial defoliation of the plants. 



Diamond-back moth. (Plutella maculipennis Curtis) 



On August 26 a piece of late sown turnips in a Montreal market garden 

 was completely eaten. On going through the patch but few cabbage worms and 

 still fewer cabbage loopers were seen. However, there was a large quantity of 

 A'ery active larvae nearly one half inch in length. These were identified as lar- 

 vae of the Diamond-back Moth, which occasionally become troublesome. 



White grubs. (Lachnosterna spp.) 



The injury from white grubs was light in most of the infested areas in 1924 

 but they did enormous damage in 1923. A big flight of June Beetles is anticipated 

 this coming May and June and if such a flight occurs serious damage is to be 

 expected in 1926. Thus the farmer should begin to plan his rotation so that the 

 least susceptible crops will be grown on infested land in 1926. A repetition 

 of last year's enormous damage may be averted by practising a proper rotation. 



Raspberry cane borer. (Oberea bimaculata Oliv.) 



The Raspberry Cane Borer was very bad in the area south of the St. 

 Lawrence River this year. A considerable amount of the two year wood exhi- 

 bited serious borer injury. There was a large number of eggs laid this year and 

 it is predicted that where cutting out was not practiced there will be consider- 

 able damage done. 



Clover head weevil. (Tychius picirostris Fab.) 



In the Quebec Society Report for 1915-16, Dr. DuPorte reported this insect 

 as doing considerable damage to red clover in the summer of 1915. He also 

 stated that the insect was present in previous years but not in sufficient numbers 

 to be of any economic importance. This year we have to report this insect as 

 being abundant in the red clover heads at Covey Hill, Que. As many as 6 to 8 

 weevils were collected from a single head. The heads were dark brown in color 

 and withered in appearance. 



Plum curculio. (Conotrachelus nenuphar Herbst.) 



This insect was not injurious in any of the fruit districts this year. Many 

 orchards were visited but very few adults were secured. 



Apple curculio. ( Tachypterelus quadrigibbus Say.) 



The apple curculio was first obseA^ed in the apple trees of June 3, increasing 

 from this date on until July 14. The new brood of adults first appeared on 



