Injurious Insects, 29 



Grape (Thrip or Leaf -Hopper), continued. 



tobacco smoke, pyretlirum poured upon coals held under the 

 vines, syringing with tobacco-water or soap-suds. Fumiga- 

 tion in the field should be done before the insects develop 

 wings— late in July or in early August (in the north) . Rake 

 ground clean about vines late in fall in order to expose 

 insects to the weather. It has been found in California that 

 thrips can be gi'eatly lessened by feeding off the leaves with 

 sheep, soon after the grapes are picked. 



Grasshoppers. — If these pests become serious, they may be kept 

 in check by the following means : Place a tablespoonful of 

 poisonous bait by the side of each tree or vine. The bait is 

 made of 40 pounds bran, 15 pounds middlings, 2 gallons 

 syrup, 20 pounds arsenic ; mix with soft water. Costs 25 to 

 75 cents per acre. Or Paris green spray may bS used. 



Hollyhock. Bug {Orthotylus delicatus, Uhl.) . — A small green bug, 

 attacking the hollyhock with great damage. 



Remedies. — Kerosene emulsion. Pyrethro-kerosene emul- 

 sion. 



Lawns. Ants (Formica sp.). — Insects burrowing in the ground, 

 forming ' ' ant-hills . ' ' 



Remedy. — A tablespoonful of bisulphide of carbon poured 

 into holes six inches deep and a foot apart, the holes being 

 immediately filled up. 



Leaf-Crumpler {Phycis indigenella, Zeller) . — Larva, brown, wrink- 

 led, found on the inside of leaves, which it brings together in 

 masses and attaches them to each other and to the twigs by 

 means of silken threads. The next season young worms 

 appear from the mass and feed on the new crop of leaves. 

 Bemedy.— Gather the masses and burn them. 



Lettuce. Aphis or Green-Fly. — A plant-louse on forced lettuce 

 Preventive. — Tobacco dust applied on the soil and plants as 

 soon as the aphis makes its appearance, or even before. 

 Renew every two or three weeks if necessary. Fumigate 

 mth tobacco. 

 GuEEN Lettuce-Worm (Plusia hrassiccB, Riley) .—Larva, some- 

 what over an inch long, pale green, with stripes of a lighter 

 color, feeding upon the leaves of many plants, a»s cabbage, 

 celery and endive. 



Remedy. — Pyrethrum diluted with not more than three 

 times its bulk of flour. Kerosene emulsion. Hot water. 



