Control of plant disease through preventive
measures is based upon exclusion,
eradication and direct protection. The
government tries to prevent importation
of new diseases and aids in the eradication
of newly introduced diseases. Farmers are
capable of controlling plant diseases to a
great extent by using scientific crop rotation
systems, sanitary measures, suitable
cultural practices, certified seed and
disease-free plants. Fungicidal costs can
be minimized if use is being made of disease
forecasting. Plant pathologists cooperating
with plant breeders and vice
versa, can supply farmers with disease
resistant material. Better varieties and
hybrids aid in reducing the cost of production.
We are entering a new era in which plant
disease therapeutants might be used extensively.
Scientists are seeking for systemic
fungicides which might be capable of
immunizing plants against infection or
which might heal diseased plants.
The important role played by cultural
practices in disease control, in order to
eliminate or to supplement chemical control
methods, has been emphasised.
The conclusion drawn is that the ability
of plants to remain healthy right through
a life cycle is more amazing than their
ability to contract disease.