THE GRANVILLE TOBACCO WILT. 21 
is peculiarly lable to attack. To a very considerable extent the 
destructive prevalence of this disease seems to hinge on the occurrence 
of root-infesting nematodes. They are common in the diseased to- 
bacco soils of Florida and probably occur also in those of North 
Carolina. 
REMEDIES AND PALLIATIVES. 
(1) This organism is to be regarded as a very bad weed lable to be 
distributed in many ways. It is worse than ordinary weeds because it 
is invisible. On plantations free from the disease a rigid quarantine 
should be erected against plantations subject to the disease. Nothing 
should be received by the farmer from the latter—seeds, young plants, 
raw tobacco, cured tobacco, packing cases, wagons, tools, fertilizers, 
laborers, horses, cattle, etc., all should be excluded. Avoid also the 
manuring of fields with tobacco waste even when it is believed to 
originate from clean sources. 
(2) Do not plant tobacco on lands subject to this disease. Rent 
healthy land at a distance if necessary. To plant infected land invites 
disaster. Jt és not safe to do so even after several years. Stevens and 
Sackett have recorded several cases where the disease returned after 
five to eight years rest of the soil, and one instance where it did not 
return after a rest of fifteen years. 
(3) Do not cultivate any other similar plants on infected land. 
Tomatoes, potatoes, eggplants, peppers, and pepinos are all more or 
less subject to this disease, and their growth will help to continue the 
organisms in the soil. Grow plants of some entirely different family. 
Look out also for solanaceous weeds. It is not known whether these 
are actual harborers of the bacteria, but it is well to destroy them. In 
the hothouse the writer has found the plant called Stramonium, jimp- 
son, or Jamestown weed quite subject to this disease. The disease is 
also readily inoculable into the black nightshade (Solanum nigrum). 
(4) Search the affected tobacco fields carefully, especially toward 
the end of the season, in the hope of finding resistant plants from 
which seed may be saved for the breeding up of resistant sorts. There 
is some hope that this may be accomplished. The intelligent planter 
can serve himself in this matter as well as help to excite general in- 
terest in the subject. The end in view is worth the expenditure of 
much time and trouble. 
(5) If it is impossible to avoid the use of infected lands, then cer- 
tainly avoid planting the wettest spots, and underdrain such fields as 
speedily as possible. 
(6) Select for the seed beds soil which is uncontaminated, and trans- 
plant to the field early, i. e., while the plants are quite small, and with 
the greatest care to avoid breaking the roots. Cultivate shallow with 
the same thought in mind. Under no circumstances use large plants 
141—I1 i 
