Integrated disease management for dracaena leaf spot disease [electronic resource].

Includes references.

Pathogenicety test on 6 month-old dracaena plants at Giza, Egypt proved that Fusarium moniliforme was the most virulent fungus resulting 30.41% leaf spot severity, followed by Alternaria alternata and Stemphylium botryosum which gave 11.32 and 9.45 % disease severity, respectively. Bio Arc at the concentration ( 3.5 g i I ) was the best treatment for decreasing the linear growth of all tested fungi. The Thyme extract at the concentration (75%) was the best treatment for decreasing the linear growth of all tested fungi. Fusarium moniliforme was the most sensitive fungus whileS. botryosum was the least sensitive ones. Topsin M 70 proved to be the most effective fungi-:ide against F moniliforme followed by S. botryosum and A. alternata since it induced the highest decrease in the linear growth of all tested fungi, whereas Kocide 2000 was the least effective ones. Topsin M 70 (at the rate 3 g/l) separately gave the best control for dracaena leaf spot under greenhouse conditions (11.9 % dt~ease severity), while sprayinr with Thyme extract at the concentration of 50 % was the best alternative treatment for this purpose (14.17 % disease severity) as comparing with control treatment (17.06 % disease severity) followed by Salicylic acid at the rate 1.5 g /1 and biocide at the rate 2.5 g / I. There are no significant differences between the application of Thyme extract ( at the rate 50 %) +half the recommended dose of Topsin M 70 and the application of Topsin M 70 alone (12.34 and 11.9 % diseases severity, respectively ). The obtained results suggested that some natural materials such as Thyme extract can be use as a method to minimize fungicidal doses against fungal diseases.

Summary in Arabic.

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