204 Proceedings of Indiana Academy of Science. 
Lafayette the disease was so severe that late in September only tufts of the 
youngest leaves remained on the plants. 
As usual Fusarium wilt was severe in the Indianapolis greenhouses. The 
wilt-resistant Marvel variety has proved acceptable to one greenhouse 
grower as a substitute for the Bonny Best. Out of numerous single plant 
selections made last year with the purpose of isolating a wilt-resistant 
strain of Bonny Best, two showed good resistance but both came into 
bearing too late to suit the desires of the growers. 
In the field crop wilt was noted as a rule only on scattered plants. From 
two to six per cent of wilt was found in 12 out of 14 fields visited near 
Kokomo July 13. In certain of these fields set with southern-grown plants 
it was practically certain, judging from the distribution and severity of the 
disease, that it was introduced with these plants. This illustrates a danger 
in the use of southern-grown tomato plants by Indiana canners. Wilt has 
not yet become a serious factor in the Indiana canning crop owing to the 
fact that so much new soil has been available and crop rotation has been 
practiced. In gardens and old tomato fields the disease persists and there 
are indications that it is also harbored in plant beds. The disease is 
very destructive under Indiana conditions and infestation of the soil 
should be guarded against. ; 
Mosaic was not as severe as in 1919, although it was very general late in 
the season. In a late epidemic of this kind the yield is not noticeably 
reduced but plants infected early in the season are likely to be valueless. 
In one field near Indianapolis there was practically 100 per cent infection 
of mosaic, much of it of the dwarfed, fern-leaf type which results in a very 
marked reduction in yield. In certain fields there was some indication that 
mosaic was carried with the seed but carefully controlled and rather ex- 
tensive tests with seed from mosaic plants have so far yielded only neg- 
ative results. : 
