INJURIOUS INSECTS. 357 



pupate, the flies of the first brood appearing late in August, 

 those of the second late in May or early in June. These 

 destructive insects belong to the very destructive family known 

 as saw-flies, so named because of the wonderful organs terminat- 

 ing their bodies, which they use to form the groove for their 

 eggs. As they may be seen in the microscope, these organs 

 are very beautiful, and would serve well for models of our 

 instruments of the same name. These cherry-tree slugs have 

 been known to work on the plum tree, and some other of our 

 shrubs. 



REMEDIES. The slime of these insects makes them peculiarly 

 susceptible to any application like ashes, road dust (some deny 

 that road dust is effectual), or lime. Hence, throwing any of 

 the above substances into the tree where these insects are at 

 work is sure to check their ravages. Such treatment goes to the 

 root of the matter by destroying the source of the evil. These 

 larvae, as also those of other slugs, as the rose slug, so destruc- 

 tive in our State, and the pine tree slug, are destroyed by such 

 solutions as white hellebore, quassia, Paris green with water, 

 whale oil soap, carbolic acid, or coal oil. These last, of course, 

 must be applied very weak, or the tree or plant will be injured. 

 My friend, E. Reynolds, has killed the pine tree slug with Paris 

 green, applied at my suggestion, one-half tablespoonful to a pail 

 of water. The same remedy will banish the rose slug. The 

 past season I have destroyed the rose slug, raspberry slug, and 

 currant slug by use of pyrethrum, as recommended for cabbage- 

 butterfly, and also by kerosene and sour milk, as used for 

 squash-bug. 



Plant Lice. Aphis mali, Fabr., A. cerasi, Fabr. Family, 

 Aphidce. Order, Ilemiptera. All our fruit men are familiar 

 with the plant lice, as hardly a plant but suffers from the at- 

 tack of some species. Yet, doubtless owing to the many natu- 

 ral enemies, and notwithstanding their wonderfully prolific ten- 

 dencies, they are rarely very destructive. Sometimes they will 

 attack a tree, and seem to draw heavily upon its vitality, and the 

 very next year not a single louse will be found on the tree. I 

 have noticed this repeatedly. 



