Archivi categoria: English edition

English editions of posts already made in italian

Mites and bacterioses in Phalaenopsis

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Continue the cooperation with Marcus V. Locatelli, this is another interesting article
published on its website and freely translated. Obviously everyone who find some mistakes or had observations, is invited to post a comment.

The bacterioses in Phalaenopsis, has the most causal agent cited in literature (at least so that I could find) the bacteria Pectobacterium carotovora, whose most common symptoms of infection are soft rot in leaves (pectolytic enzymes released by Pectobacterium carotovora in the internal tissue of the plant, mesophyll, pectates of Ca degrade the middle lamella which is the “cement” that unites in plants one cell to another) and soft rot in pseudobulbos, that rot is also called anasarca (ponding regions and bad smell). In addition to this agent, cited were other bacteria with the potential to cause disease in orchids in general, such as Pseudomonas sp., Erwinia carotovora, Erwinia chrysanthemi and Acidovorax avenae pathovar cattleyae, but to properly identify it is necessary biochemical tests more complex.
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Orchids, what at highest elevation?

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This is the question that I place, following an opinions exchange got in an Italian forum, where someone said that the name of Sobralia altissima was originated from the fact that this orchid was found at the greater altitude.
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Particular biotopes four steps from home

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Despite temperatures not too favorable of the past week and the incessant rains, the orchids weren’t been frightened and Saturday, after a patrol tour, unexpectedly, but with my big joy, some orchids have already begun to revive the meadows with their colors.
foto Massimo Morandin

First of all, revealing the queen of spring in my area, Orchis mascula (Early-purple Orchid) (L.) L., Fl. Suec., ed. 2: 310 (1755) that presumably will be followed by Listera ovata (Common Twayblade), Neottia nidus-avis (Bird’s nest Orchid) and Cephalanthera longifolia (Narrow-leaved Helleborine).
The area of discovery presents a particular habitat consists of a small and narrow valley crossed by a small river always fed, where the sun, in spring/summer and for few hours, lights in the morning the north side facing south and in the evening the south side facing north.
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