56 INSECTS INFESTING THE APPLE TREE 



CHAPTER XVIII. 



The Woolly Aphis. 



( iSchizoiieura lanigcra — Hausman). 



Synonyms. — Aphis lanifiera — Hausman. Coccus mali — Bing- 

 ley. Eriosoma mali (Leach, M. S.) — Samoiille. Mijzoxylus 

 mali — Blot. Schizoneura lanigera — Hartig. Pemphigus pyri 

 — Fitch. Aphis (Schizoneura) lanigera — Ratz. Eriosoma 

 lanigera — Ruricola. 



Order, Hemiptera ; ^ 17 -i \ ^.^ ^ 



o 1 ' 1 TT I r aiiiilv, Aphidid.e. 



Sub-order, Homopteka ; ) • ' 



[Living in hollows on the trunk or limbs of apple trees, a 

 small phmt-louse, which is more or less covered with a white, 

 cottony matter.] 



The presence of this insect can readily be detected from the 

 appearance of the tree infested ; the l)ranches appear knotty, 

 the wood dry, hard, and ])rittle, and the general ai)})carance is 

 that of over-age and decay. Its distriliution may be said to 

 be general in this State on apple trees, and it is very generall}' 

 distributed on a})ple nursery stock. The opinions of writers 

 (lifter as to whether the insect found on the roots, and those 

 on the trunk and limbs, are the same species, some contending 

 that they are similar, and that those on the trunk and ])ranches 

 go to the roots and hibernate during the winter, or deposit 

 their eggs for the next season's brood, while others contend 

 that they are distinct species. For the present purpose it is 

 sufficient to know that one or more species infest our trees. 

 The climate of California may be favorable to their hibernating 

 throughout the winter season on the trunks and limbs, as I 

 have found them in crevices of the l>ark throughout the winter 

 season, and at the same time finding them on the roots. To 

 destroy these insects efltectually they must l)e attacked on the 

 roots, and on the trunk and branches at the same time. 



