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发表于 2023-4-29 20:42
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来自： 中国上海
不用，环境改善了，自然就会抑制住病情发展。
你的百合看上去，像得了贵腐菌，发病了就无药可医。
见下：
Cause
Most “fire” is caused by Botrytis elliptica. Under moist conditions, Botrytis elliptica generates spores
that can spread very quickly to nearby plants when carried by rain and wind. On a dry crop, however,
the spores cannot germinate, so this lack of water will keep an infestation at bay. At the end of the
season, the fungus on infested and necrotic tissue will form round black sclerotia 2-3 mm in diameter
that can survive in the soil for one to two years.
Within the lily assortment, there are substantial differences in susceptibility to this fungus. The
Asiatic, the LA hybrids and Longiflorum hybrids are much more susceptible than the Oriental
hybrids. Within the Asiatic and LA hybrids, the white and pink cultivars are especially susceptible.
Control
Keep the crop dry by:
 reducing planting density during a period of a high RH
 controlling weeds
 watering the soil in the morning and providing ventilation simultaneously with some heat.
The crop should dry off quickly and, in any case, be dry before nightfall.
 not sprinkling during times of little wind or high RH
 preventing condensation in the morning by a starting to increase the temperature about one
hour before sunrise.
- If infestation is expected (upcoming period of high RH), fog regularly with alternating Botrytis-
controlling fungicides starting in an early stage of development (definitely before the leaf canopy
closes).
- Remove infested plants as quickly as possible to reduce the chance of spreading in the greenhouse.
- As the flowering period approaches, a fungicidal smoke agent that leaves no visible residue on the
plants can be used.
- Cultivation in a screened greenhouse increases the risk of Botrytis infestation; the use of a movable
shading system reduces the risk of Botrytis infestation.
- Carefully remove crop residues after the completion of cultivation.
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