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In Crassula multicava Lam. anthocyanins are formed naturally mostly in the stem near nodes and only traces in other parts of internodes. Methyl jasmonate (JA-Me) applied in lanolin paste at concentrations of 0.05, 0.1, 0.5 and 1.0% on the middle part of internodes greatly stimulated anthocyanins accumulation in the internodes and in the nodes of Crassula multicava. The stimulatory effect was higher in younger tissues of the Crassula multicava stem than in older ones, and depends on the used concentration of JA-Me. The possible role of jasmonates on anthocyanins formation in Crassula multicava is discussed.
The aim of this work was to determine the cause of leaf spotting of Crassula multicava and potential methods of their control. The leaves of succulent Crassula multicava growing in greenhouse conditions showed disease symptoms, yellow and gradually browning spots, and the disease was caused by Pestalotiopsis guepinii . The strobilurin fungicides, azoxystrobin (Amistar 250 SC), kresoxim - methyl (Discus 500 WG) and chlorotalonil with addition of zinc (Gwarant 500 SC) greatly inhibited the growth of Pestalotiopsis guepinii . Total inhibition of the myce lium growth was observed when azoxystrobin at concentration of 6 μ g/cm³ was added. Kresoxim - methyl and chlorotalonil with addition of zinc at a concentration of 10 μ g/cm³ limited the mycelium growth in 98% and 80% respectively. The inhibitory effect was gr eater for azoxystrobin than kresoxim - methyl and chlorotalonil. Preventively and curatively used of synthetic analogs of strobilurins and Gwarant greatly limited the development of Pestalotiopsis guepinii.
The leaves of succulent Crassula multicava growing in greenhouse conditions showed disease symptoms, yellow and gradually browning spots, and the disease was caused by Pestalotia sp. In the excised healthy leaves of Crassula multicava kept in natural or inverted position in natural light conditions the accumulation of red-violet anthocyanins were formed but in the excised leaves with disease symptoms caused by Pestalotia sp. kept in the same light conditions anthocyanins did not form at a distance of about 4-8 mm from infected spots. The possible mechanism of anthocyanins accumulation in the excised healthy leaves of Crassula multicava in light and the lack of anthocyanins accumulation around the infected spots caused by Pestalotia sp. is discussed.
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