170 EXPERIMENTAL FARMS. 
63 VICTORIA, A. 1900 
Prof. Lugger. Reports from Prince Edward Island this year mention serious injury by 
Hessian Fly ; this is most probably owing to the increase in the numbers of these 
parasitic species. 
THE DESTRUCTIVE PEA APHIS 
(Nectarophora destructor, Jnsn.). 
Attack. —Pale green plant-lice with 1»gs darkened, particularly at the joints, honey 
\ 
Fig. 7.—The Destructive Pea Aphis: 
wingless viviparous female—enlarged, 
tubes very long ; clustered in enormous num- 
bers at the tips of the shoots, beneath the 
leaves, and sometimes over the whole plants 
of field peas, as well as upon the flowering 
Sweet Peas. These insects appear suddenly 
in large numbers and very soon kill the plants 
by sucking their sap. The winged specimens 
are rather large for aphides, being about one- 
eighth of an inch in length, with a wing 
expanse of nearly one-quarter of an inch. 
One of the most remarkable outbreaks of 
the year, which extended over a very wide 
area, was by a previously undescribed species of 
plant-louse. This was reported from various 
places in Canada from the Maritime Provinces 
to Western Ontario, even extending up into 
the sparsely settled country in the Nipissing 
District. It also occurred in destructive 
numbers in many parts of the United States ; 
Prof. Johnson, of Maryland, the describer of 
the species, who read a paper on the subject at 
the last meeting of the Association of Econo- 
mic Entomologists, says :— 
Fig. 8.—The Destructive Pea Aphis: winged viviparous female—enlarged. 
(Figs. 7 and 8, after Johnson, Md. Agr. Exp. Sta. Bul. 63.) 
‘Pea growers nearly everywhere along the Atlantic coast consider that they have been 
visited by a veritable scourge. The attack has not been confined to Maryland alone, 
but I have records of the occurrence of the pea-louse in Delaware, New J ersey, New 
York (Long Island), Pennsylvania, Virginia, North Carolina and Connecticut. 
