Bull. Spec. CORESTA Congress, Yokohama, 1996, p. 185, PPOST4

Integrated management of soilborne diseases of tobacco in seedbeds

NAGARAJAN K.; REDDY T.S.N.; RAJU C.A.
Central Tobacco Research Institute (CTRI), Rajahmundry (A.P.) India
Among several seedbed diseases of tobacco, damping-off caused by Pythium aphanidermatum , leaf blight caused by Phytophthora parasitica F. nicotianae and anthracnose caused by Colletotrichum tabacum are the most serious, resulting in enormous loss of transplants. Research studies conducted at CTRI revealed that these diseases can be effectively controlled by an integrated method as follows:
a) Deep summer ploughing of the nursery area with disc plough;
b) Rabbing or solarization of nursery beds for 4-6 weeks;
c) Use of seed rate @ 3.5 to 4.5 kg/ha;
d) Use of Trichoderma harzianum @ 25 g/m2 one week before sowing;
e) Spray drenching of copper oxychloride fungicides @ 0.2% 30 days after sowing;
f) Two sprays of metalaxyl (Ridomil MZ 72 WP) @ 0.2% on 40 and 50 days after germination.
By following the above, the Integrated Pest Management Cost:Benefit ratio was 1:6.84.