lis B.C. ExTO.MOLOGic.AL Society. 



Green aiJliis is active all the year round, but more iiarticularly so from April 

 to November. The best wa.v to keeji it clown is by frequent fumijjiating and spraying, 

 so as not to let it get a strong bold. If the greenhouses are fumigated regularly 

 every week or ten days. little trouble will be experienced from this pest. 



Black Aphis. 



This insect is similar to the green aphis, excepting in colour, but does not attack 

 as many varieties of plants. In fact, I have found that the only serious attack has 

 been on chrysanthemums, and the same remedies as advised for green aphis will 

 do for the black aphis. In fact, I have found it easier to exterminate than the 

 green aphis. 



White Fly. 



This Is the common name that this insect is known by In the Victoria District, 

 but from the same authority as quoted re Thrlps, I do not think I can give a better 

 description, which Is as follows : — 



General Appearance. — The adult white flies are about '/:.„ inch long, the males 

 being slightly smaller than the females. The bodies are yellow and the wings pure 

 white. The eggs are exceedingly small, oblong in shape, at first light green, growing 

 black with age and attached by a short stipes. The larvre are light in colour, trans- 

 forming to flat pupie about y,oo inch long; oblong oval in shape; light green and 

 supporting noticeable wax-like rods or spines, which make this species readily 

 distinguishable from all others. 



Life-Jiistorii. — The eggs are laid upon the leaves of the plants, each female 

 depositing over one hundred. These hatch in about two weeks into larv;p, which 

 begin feeding very shortly, and after three moults, covering nearly a week, they 

 become pnpiB, which after two more weeks are ready to emerge from the old pupal 

 skins as adult insects. The adult feed constantly throughout their existence of some 

 thirty days. 



Food-plants. — Tomatoes and cticumbers seem to suffer most from the attacks of 

 this pest, though a large number of other plants are infested, including the bean, 

 egg-plant, melon, lettuce, grape-leaves, aster, chrysanthemum, salvia, lantana, fuchsia, 

 rose, coleus, geranium, primrose, ageratnm, etc. 



This insect, I have reason to think, vras imported into this district some eight 

 years ago. That is when it first came to my notice. I think it must have been 

 brought in on plants imported from Eastern Canada and the Eastern States, as 

 previous to seeing them here I had noticed their presence mentioned In the different 

 trade papers, and inquiries made about them and as to the best way to combat them. 

 In this district they are most troublesome to the tomato-grower, and I have known 

 instances when the plants have been infested with thousands of them. Some 

 gi-owers use tlie Gerod process of fumigating to destroy them, but, unfortunately. 

 I have known as much Injury, if not more, has been done by this than what the 

 insect would do. So far, I have found the hest method is to fumigate with the 

 nicotine solution as soon as the pest Is noticed. By this means we have been able 

 to keep it in check sufHciently, so that our loss has been very slight, but we take 

 great care that all plants, after the croj) has been gathered, are burnt up. 



If the grower, after his crop is gathered, and the plants burned and the green- 

 house is empty of all (jther plants, I believe that it would be a good plan to fumigate 

 with potassium cyanide, but care must be exercised that the walls between the house 

 fumigated and the adjoining house are tight — that Is, if the houses are adjoining — 

 and as a matter of precaution the adjoining houses should have their ventilator.s 

 left open while the affected house is being fumigated. I think that the resin spray. 

 as recommended by the Provincial Board of Horticulture, as a summer spray, should 

 prove of value in fighting this insect, and if we are troubled with it very much this 

 season I intend to try it. 



