IN MEMORIAM, MRS. A. A. KENNEDY. 2O9 



tributing her share of useful information. For nearly ten years 

 she was one of our vice-presidents and never failed to attend our 

 annual meetings. Sister Kennedy was possessed of a happy tem- 

 perament and dispensed cheerfulness, contentment and sunshine to 

 all around her. She was a devout Christian woman all her days, 

 her every day life was one that millions of her sex might follow 

 with great advantage to the race. Full well she did her whole 

 duty in life and passed before us to a rich reward. — O. F. Brand. 



SCALE OIM PINE TREES. 



PROF. SAMUEL B. GREEN, ST. ANTHONY PARK. 



About fourteen years ago we bought some Scotch pine trees 

 which in a few years showed some reddish scale insects that seemed 

 to quite seriously injure the growth in the parts of the plantation 

 where the trees were protected from wind. This finally got to be 

 so bad that we thinned out every other row of trees so as to let 

 in the light and air, as the insect did not seem to thrive well where 

 exposed. Several years ago we sprayed with a mixture of kero- 

 sene and water and were quite successful, but it seemed almost a 

 hopeless task to destroy all the scales, which by this time had 

 spread from the Scotch pine to jack pine and mountain pine, 

 though it did not seem to thrive upon our conifers. 



This spring we made up our minds to go at it even more 

 thoroughly tlian we had in the past, and with this end in view pre- 

 pared abundant scale wash, but when we got ready to apply it the 

 scales which were abundant upon the pines last autumn had almost 

 entirely disappeared, so that it was difficult to find a scale or even 

 an egg of this insect. 



The destruction of this pest is a great relief, for I had thought that 

 possibly the Central Experiment Station was the only place in this 

 section that was infested and felt a responsibility that it might be 

 a center of infection for what would prove to be a serious pest to 

 our horticulturists. I do not know just the reason why this scale 

 has so suddenly disappeared, but know that last year Prof. Wash- 

 burn reported quite a large number of larvae of the lady bug 

 among them, eating the young. It seems to me, however, that there 

 must have been some other parasite to have made this work so very 

 complete. 



With most of our insc^cts the history of their "rise and fall" is 

 much the same. They increase very rapidly perhaps for a short 

 time, when their parasites become numerous and fin?.lly destroy 

 them, after which the parasites themselves die for want of food, and 

 then the insects again increase ; and so we have some insects that 

 come, as it were, in waves. It will be remembered that a few years 

 age we had much trouble with the forest tent caterpillar, that it 

 stripped the foliage off of almost every broad-leafed tree. But it 

 disappeared very suddenly, due to the presence of an internal para- 

 site which dest'roved them. 



