Abstract:
The collar rot disease of Tomato (Solanum lycopersicon L.) caused by Sclerotium rolfsii (Sacc.)
is a severe soil born disease, particularly in the undulating red and lateritic zone of West Bengal
causing considerable crop loss. An experiment was carried out to develop a sustainable
management strategy against the collar rot disease at Agricultural Farm of Palli Siksha Bhavana
during the winter season of 2014-16.Various treatments of different approaches viz. (1) Mulching
by transparent polythene (25 micro m) (2) Mulching + Neem Seed Cake@ 150 kg/ ha. (3)
Mulching + Tricoderma harzianum @ 2.5 kg/ha. (4) Mulching + Garlic Extract @ 20 % (5.)
Mulching + Vermicompost @ 5 t/ha. (6) Mulching + Gypsum @ 4 tone/ ha. (7) Mulching +
salicylic acid @ 10 ppm. (8) Mulching + Neem Seed Cake @ 150 kg/ ha. + Tricoderma
harzianum @ 2.5 kg/ha. (9.) Mulching + Garlic Extract @ 20 % + Tricoderma harzianum @ 2.5
kg/ha. (10) Mulching + Gypsum @ 4 tone/ ha. + Tricoderma harzianum @ 2.5 kg/ha. (11)
Mulching + Vermicompost @ 5 t/ha + Tricoderma harzianum @ 2.5 kg/ha. (12) Mulching +
Tricoderma harzianum @ 2.5 kg/ha. + Salicylic acid @ 10 ppm were evaluated against the
disease under field condition. All the treatments performed well in terms of reducing the disease
incidence and resulted in higher fruits yield compared to untreated control. Least disease
incidence (4.17 %) and highest fruits yield (250.67 Q/ha) was observed in treatment with
mulching by transparent polythene + Neem Seed Cake @ 150 kg/ha (soil application) +
Tricoderma harzianum @ 2.5 kg/ha (soil application) followed by mulching + gypsum @ 4
tonne/ ha. + Tricoderma harzianum @ 2.5 kg/ha treated field with 5.56% disease incidence in
comparison to disease incidence (27.78 %) and fruits yield (200.67 Q/ ha) in untreated control.
The combination of different approaches had an edge over individual approaches.
