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Frost will destroy fresh growth causing stems and leaves to wilt, turn black and fall away from the plant. Timing pruning to promote growth after the threat of frost is a means to avoid frost damage. Salinity will present in roses as limp and light brown leaves with dry leaf margins. Soil may require testing to determine salinity levels ...
White mold affects a wide range of hosts and causes sclerotinia stem rot. It is known to infect 408 plant species. As a nonspecific plant pathogen, [2] diverse host range and ability to infect plants at any stage of growth makes white mold a serious disease. The fungus can survive on infected tissues, in the soil, and on living plants.
Phragmidium tuberculatum, also known as rose rust, is a parasitic fungus that feeds on living cells of a host plant. It can affect all species of the family Rosaceae. This includes all species of roses. Rose rust causes distortion and discoloration on stems. Sometimes it will cause galls and lesions.
A new study has found how a rose and other plants like a tomato and eggplant came to get their prickles. The discovery could help engineer new thorn-free variants.
Powdery mildew is one of the easier plant diseases to identify, as the signs of the causal pathogen are quite distinctive. Infected plants display white powdery spots on the leaves and stems. [1] This mycelial layer may quickly spread to cover all of the leaves.
Prickle: A sharpened extension of the stem's outer layers, e.g. roses. Pseudostem: A false stem made of the rolled bases of leaves, which may be 2 to 3 m (6 ft 7 in to 9 ft 10 in) tall, as in banana. Rhizome: A horizontal underground stem that functions mainly in reproduction but also in storage, e.g. most ferns, iris.
Fasciation (pronounced / ˌ f æ ʃ i ˈ eɪ ʃ ə n /, from the Latin root meaning "band" or "stripe"), also known as cresting, is a relatively rare condition of abnormal growth in vascular plants in which the apical meristem (growing tip), which normally is concentrated around a single point and produces approximately cylindrical tissue ...
The disease is found everywhere roses are planted, typically in epidemic proportions. [8] The water-borne dispersal methods allow it to infect a plethora of plants every growing season and increase the overall incidence of disease. Although Diplocarpon rosae does not kill the rose itself, it is known to completely defoliate the leaves of the ...