1901 



ENTOMOLOGICAL SOCIETY 



47 



regarding tlie purplisli swellings or blister-like elevations on affected leaves, which 



make their appearance in May. In the con- 

 cavities on the under surface will be found clustered 

 large numbers of Apliids, both winged and 

 unwinged, all busy sucking the juices from the 

 leaf. 



It is seldom that these Aphids are troublesome 

 after midsummer. 



Prompt picking of affected leaves, or application?- 

 t f Kerosene Emulsion, whale oil soap solution, or 

 Gillett's Lye, are the best methods of dealing with 

 Currant Aphis. 



F.g. 2.i. 



Plant-lice (A.phia) winged and whit?- 

 less (much enlarged). 



Chekhv Aphis (Mi/zns i-emd). 



During .J\ine the cherry trees in many sections Ijecame badlj' infested with plant-lice 

 {Myzus cerasi). The leaves of the large terminal twigs were chiefly affected. They became 

 much distorted, and discolored by a fungus feeding on the honey-dew, and with excrement ; and 

 then became inrolled with the Aphid.s feeding within. The effects on the leaves are detrimental 

 to the growth of the tree, inasmuch as much nourishment intended for the development of the 

 tree is taken l)y the plant-lice within their own bodies. 



These Aphids are shining black insects. Ttiey frequently multiply so very rapidly that the 

 smaller leaf stalks and twigs become completely covered with them. The leaves and branches 

 near bj' become very sticky from the abundance of honey-dew excreted. 



Enemies of the Cherry Aphis are usual- 

 ly present, and kill an astonishing num- 

 ber, sometimes almost ridding the trees. 

 The life-history of the Cherry Aphis is 

 similar to th^t of other Aphids which 

 apjjear on many cultivated plants. They 

 winter over in the egg-stage ; in early 

 spring the eggs hatch ; and a brood of 

 females appear, which produces living 

 young at a rapid rat3 on the Cherry up 

 till luly, vvhenthey di.^appear. Although 



not definitely _ proved, it is probable that the lice migrate to the 

 roots of the Cherry, and to other plants. In autumn, a brood of 

 winged males and females make their appearance. After matint', 

 the females deposit eggs for the winter about the buds of the 

 C])erry. 



Treatment, to l)e effective, must begin early, before the Aphids 

 roll the leaves around themselves ; otherwise they are difhcult to 

 kill. Kerosene emulsion, tobacco solution and whale-oil soap 

 solution are all good. 



(10 lbs. of tobacco waste are thoroughly soaked in water ; and the 

 solution is made up to 40 or 50 

 (jallons. Dr. Fletcher recom 



Fig. 24 Snowy Tree- 

 Cricket, male. 



Fig. 26 



Snowy Tree-Cricket, 

 a twig showing punctures, 6 



same split op=;n, showing egg« , ^, ,,. . c i u c 



m position, c egg magnifit-d, '< m. nds the addition of 1 lb. of 



granulated top of egg. (Riley) whale-oil soap to the barrel of p;^ gg g^ 

 tobacco solution). 



owy Tree-Cricket, Fe- 

 male. 



