flavor in the ripened fruit.

=Leaf curl.=--The effect of pruning is to stimulate growth and to
increase the size of the leaves, the effort of the plant being to
maintain a balance between roots and foliage. With rapidly growing
plants, especially in the greenhouse and garden where both high manuring
and pruning have been practiced, more or less curling and distortion of
the leaves may result without developing into serious trouble if the
grower takes the hint and modifies his methods so as to permit a more
balanced growth. On the other hand, the ill effects of over-feeding and
pruning may reach a point where the plant is seriously crippled.

=Edema.=--Under certain conditions plants in greenhouses or even in the
open field, may absorb water through the roots faster than it can be
transpired through the leaves, with the result that dropsical swellings
or blisters occur on the leaves and more succulent stems. There is also
a deformation of the foliage, much like the leaf-curl produced by
over-feeding. This trouble, known as edema, occurs when the soil is
warmer than the air, or during periods of moist, warm, cloudy weather,
which checks transpiration. The grower should cease pruning, and
withhold water, and in the field cultivate deeply. In the greenhouse,
adequate ventilation should be given, keeping the house dry rather than
moist.

=Mosaic disease.=--The tomato is occasionally subject to a trouble allied
to the mosaic disease of tobacco. It is characterized by a variegation
of the leaves into light and dark green areas, usually accompanied by
distortion and reduction in size. In severe cases a whole field may
become worthless. While the nature of this malady is not fully
understood, it is known to be due to a disordered nutrition of the young
leaf-cells. It can be produced by severe pruning or by mutilation of the
roots in transplanting, both of which should be carefully avoided. It is
more likely to occur in seedlings that have made a soft, rapid growth on
account of an excess of nitrogenous fertilizer or too high temperature.
Close, clayey soils, on account of their poor physical condition, also
favor the development of the disease after transplanting.

=Western blight (Yellows).=--In the North Pacific and Rocky Mountain
states, serious losses are annually caused by a disease apparently
unlike any eastern trouble. It is marked by a gradual yellowing of the
foliage and fruit. Development is checked, the leaves cur