8 BULLETIN 1015, U. S. DEPARTMENT OF AGRICULTURE. 
ton, and the Tennessee A 16-2. a wilt-resistant variety developed by 
Bain and Essary, were almost free from wilt; while the John Baer, 
Greater Baltimore, Stone, Eoyal Eed. Delaware Beauty, Early Jewel, 
Eed Head, and Bonny Best were nearly destroyed by the wilt. More- 
over, the differences were much greater than the figures in Table 1 
show. 
Livingston's Globe and Livingston's New Globe possess consider- 
able resistance to wilt, but not so much as the more highly devel- 
oped resistant varieties. 
The Mansfield Tree tomato resisted the disease fairly well in the 
one test made, but produced little fruit. It is. by no means certain 
that it possesses as much resistance as the results of this test indi- 
cate. The Success and the Mississippi Girl gave good results in one 
test, but poor results in another. 
From the results of these tests it is not surprising that the Bonny 
Best, one of the most productive varieties grown in the Middle At- 
lantic and Middle Western States, dies so rapidly in many places in 
the South. No different results could be expected from so susceptible 
a variety. The John Baer, Early Jewel, Royal Eed, Delaware 
Beauty, Eed Head, and Willis would probably do no better. 
INTRA VARIETAL VARIATION. 
Most varieties of tomatoes differ little from one another in the wilt 
resistance possessed by their individual plants. Very susceptible 
varieties, such as the Bonny Best, Delaware Beauty, John Baer, and 
Eed Head, usually show about the same variation in intravarietal re- 
sistance as the fairly resistant varieties, Livingston's Globe, Duke of 
York, and Buckeye State. A few varieties, such as Stone, Greater 
Baltimore, and Merveille des Marches, possess a much wider range of 
intravarietal resistance than the average. By selecting and testing a 
considerable number of plants from these varieties strains can be ob- 
tained that transmit a high degree of resistance to their progeny. 
BEHAVIOR OF SELECTIONS. 
Most plants selected for resistance to wilt transmit to their progeny 
no more resistance than is possessed by their parent varieties. A 
few excel in this respect, but their number is very small. Moreover, 
these few. even when selected from the same variety, differ in the 
degree of resistance they transmit. 
Selections from a variety that transmits about the same degree of 
resistance to all its individual plants seldom transmit increased re- 
sistance. The}' are therefore probably fluctuations caused by in- 
equalities in soil infestation, drainage, etc. A large number of selec- 
tions from three such varieties, Livingston's Globe, Buckeye State, 
and Duke of York, were tested by the writer, but not one surpassed 
