ISHS Acta Horticulturae 659: VII International Symposium on Protected Cultivation in Mild Winter Climates: Production, Pest Management and Global Competition
EFFECT OF SALINITY AND BACILLUS SUBTILIS ON WHITE FLY (TRIALEURODES VAPORARIORUM, WESTWOOD) IN HYDROPONICALLY GROWN TOMATOES (LYCOPERSICON ESCULENTUM MILL.) |
| Authors: | M. Woitke, A. Hanafi, W.H. Schnitzler |
| Keywords: | Bacillus subtilis, tomato, Lycopersicon esculentum Mill., white fly, Trialeurodes vaporariorum Westwood, insect population de-velopment |
| Abstract:
Motivation for this investigation was the recognition that plant physiological responses will change under different salt levels in the nutrient solution with poten-tial impact on white fly behavior. Bacillus subtilis induces plant resistance to stress and produces plant hormones for growth improvement. White fly population growth and development were examined on tomato plants grown under 3 salinity regimes (EC 0, 2, 4 NaCl) in an environment controlled greenhouse. In addition, the high Na-salinity level (EC 7.4) was inoculated with the plant growth promoting bac-teria B. subtilis in the root zone. White fly immature counts had distinct trends with the largest numbers occuring in the highest salinity level with B. sub-tilis. However, this treatment produced the most vigorous vegetative growth with significantly larger leaf size as compared to the other treatments. White fly popula-tion dynamics are discussed in relation to sugar concentrations (glucose, fructose, sucrose, oligosaccharides and polysaccharides) as well as N- and NaCl-contents in the tomato leaves of plants grown under the 4 salinity regimes. | |
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