Relationship between the soil environment and tomato resistance to bacterial wilt (Pseudomonas solanacearum): 4. Control methods
1983
Power, R.H. (Suriname Univ., Paramaribo (Suriname))
Experiments to prevent or control the wilt disease with different substances were carried out. Favourable control effect was obtained with bimonthly foliar sprays of a 0.3 % CaCl2 solution, but it did not give vigorously growing plants. Best control and growth vigor in field plots occurred, however, when sea-shell grit (42 % CaO) was mixed into the tilled layer at a rate * m**3 (cubic metres) of approximately 1m**3 per 15m**3 susceptible soil. Feliar sprays of a 0.3 % Ca(N03)2 solution bimonthly, stimulated the vegetative development of the host and the incidence of bacterial wilting, even on sea-shell amended soils. This implies that nitrogen had a strong antagonistic effect on the absorption and translocation of calcium. Retarding the growth of tomato plants in the field by foliar application of a 2,000 ppm solution of CCC ((2-chloroethyl)-trimethylammoniumchloride) decreased both the host plant growth rate of bacterial for almost 3 weeks; thereafter the stem elongation of healthy plants and the amount of infected plants increased rapidly in time.
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