02016naa a2200205 a 450000100080000000500110000800800410001910000240006024501360008426000090022052014030022965000210163265000130165365300130166665300160167970000220169570000220171770000230173977300480176210519291996-05-28       1993    bl ---       0--  u    #d1 aGONZALEZ-TORRES, R.  aThe effects of soil solarization and soil fumigation on fusarium wilt of watermelon grown is plastic houses in south-eastern Spain.  c1993  aThe effects of pre-planting solarization or fumigation with metham-sodium of sand-mulched soil on fusarium wilt of watermelon in plastic house culture were investigated at Almeria, south eastern Spain. In two trials, 2 months' solarization increased the average maximum soil temperature by c. 5oC to 44-48oC at 10 cm depth and by 4-5oC to 40-42oC at 20-30 cm. The amount of Fusarium oxysporum in the upper 15 cm of a naturally infested soil was reduced by solarization and by fumigation. During the 9 months following treatment, the F. oxysporum population stabilized at a low level in soil solarized for 2 months, but fluctuated in soil solarized for 1 month and increased in fumigated soil. The amount of wilt in watermelon sown into this soil after treatment was generally low; plants growing in solarized or fumigated soil suffered lesswilt than plants in untreated soil but the differences were not significant. In a soil artificially infested with the highly pathogenic race2 of F. oxysporum f. sp. niveum, F. oxysporum populations were greatlyreduced following solarization or fumigation, and fluctuated erratically thereafter. Solarization for 2 months completely controlled wilt inwatermelon and gave a fruit yield almost five times that of plants in untreated soil. Solarization for 1 month only slowed disease development slightly but gave a yield more than twice that in untreated soil.  aDoença Fúngica  aMelancia  aControle  aSolorizacao1 aMELERO-VARA, J.M.1 aGOMEZ-VAZQUEZ, J.1 aJIMENEZ-DIAZ, R.M.  tPlant Pathologygv.42, n.6, p.858-864, 1993