Resource Book on Horticulture Nursery Management

Disease Symptoms and Damage
pathogens cause pre- and post
emergence damping off and wire
stem of seedlings. It causes
mortality of seedlings.
Management
Stem rot/ foot Rooting of seedling stem near Spray Kavach/Rovral/Metalaxy/M
rot/ collar rot collar region
ancozeb/ Aliette (2 g/l)
Leaf spot Dark brown to light brown, tiny
pustules on leaf surface, the
pustules soon enlarge and turn
blakish in the centre
Wilt The foliar are yellowing and
production of crookneck shoots.
The leaves and shoots wither and
become brownish. Stems when
cut open show brown
discoloration at the vascular
region.
<strong>Resource</strong> <strong>Book</strong> on Horticulture Nursery Management : 78
Spray Carbendazim/Bitertanol/
Thiophavate methyl, Calixin,
Kavach/ Rovraal (2 g/l.) in rainy
season/ November
Soil fumigation and treating the
nursery beds with benlate or with
Thiophanate methyl and using
Tricoderma etc.
Biological Control Measure
Biological control is defined as the use of a living organism to control or manage
another living organism. Natural enemies include parasites, predators, fungi, nematodes
and viruses. Most biological control programs are directed at insects and mites. However,
plant disease suppressive composts are being used to effectively reduce problems with
certain root rot pathogens. In addition, new products are being introduced for biological
control of root and foliar diseases.
Natural enemies are often used similar to a regular fungicide application program;
that is, introduced on a regular basis. Even more than with fungicide, disease
management will fail if pest populations are too high when the natural enemies are
introduced. Biological controls are not rescue treatments. Often, disease pathogen
populations will not decline and probably will even increase for several weeks to two
months after introducing natural enemies.
4.2.3 Weed Management in Horticulture Nursery
Weed management is an important component of plant protection for improving the
production potential of nursery. It includes management of the weeds in such a way that
the nursery sustains its production potential without being harmed by the weeds. Weeds
are the plants that grow without human efforts and are not wanted. They grow in the
fields where they compete with nursery plant for water, soil nutrients, light, and space.
Proper weed management is a pre-requisite for obtaining higher input efficiency. Weeds
also act as alternate hosts that harbor insects, pests and diseases and other microorganisms.
Some weeds release growth inhibitors or poisonous substances into the soil.
These may be harmful to the nursery plants, human beings and livestock. Weeds reduce