1922] GARDNER & KENDRICK—TOMATO MOSAIC 475 
1920 a number of rootstocks of mosaic P. subglabrata plants were 
dug in the Frankfort field and planted in a small plot surrounded 
by a wooden frame sunk in the soil in a garden at Lafayette. 
These rootstocks established themselves and produced shoots in 
the fall of 1920. The rootstocks remained alive over winter, and 
in the spring of 1921 sent up shoots showing mosaic. Six shoots 
had appeared by May 13, thirteen by May 23, and on June 3 
fifteen plants were present. These mosaic Physalis shoots appeared 
well before the date that tomatoes are transplanted to the field, 
and all showed definite mosaic symptoms as soon as the leaves 
unfolded. 
A number of aphids were found on these Piysalis plants early 
in the season. On May 23 about twenty-five of these aphids were 
collected and caged on three small healthy tomato plants in the 
greenhouse. Fourteen days later one of these tomato plants showed 
mosaic. None of the six control plants developed the disease. The 
aphids soon disappeared from the Physalis plants in the field, but 
this test indicates that mosaic might be transmitted from Physalis 
to tomatoes by these insects. 
Artificial inoculation of tomatoes with the virus obtained by 
crushing some of the leaves from three of these mosaic Physalis 
shoots also was successful. Ten small tomato plants were inocu- 
lated on June 24 by wounding the stem with a needle and rubbing 
the wounded area with cotton soaked in the Physalis virus. Eleven 
days later all had developed mosaic. Ten control tomato plants 
were similarly treated except that sterile water was substituted 
for the mosaic virus, and nine of these remained free from mosaic. 
These tests show that the mosaic virus persists over winter in the 
rootstocks of P. subglabraia, that the young shoots come up dis- 
eased at an earlier date than tomatoes are set out in the field, and 
that the disease is readily transmissible from these shoots to 
tomatoes, 
Mosaic PHYSALIS IN FIELDS PREVIOUSLY IN TOMATOES 
To determine how generally the mosaic disease was carrying 
over winter in the Physalis plants (including both P. subglabrata 
and P. virginiana), an examination was made in and near fields 
