Nepaljam x Oaxaca
Active Member
Abiotic diseases
Diseases from abiotic(non-living) causes often arise suddenly. They usually resemble diseases caused by living organisms. Some abiotic diseases have unknown causes,such as "grandine" of hemp. Abiotic problems also predispose plants to other diseases. Drought-stressed plants, for instance, become much more susceptible to fungal cankers.
The most common abiotic diseases are nutrient deficiencies. Generally, deficiencies of mobile nutrients (N, P, K, Mg, B, Mb) begin in large leaves at the bottom of plants. Shortages of less mobile nutrients (Mn, Zn, Ca, S, Fe, Cu) usually begin in young leaves near the top.
Pollutants take their toll. Sulfur dioxide causes interveinal leaf chlorosis and hydrogen fluoride causes a complete chlorosis in Cannabis. Sharma & Mann (1984) found C. sativa ssp. Indica near a Himalayan highway suffering chlorosis andnecrosis. Automobile-polluted plants produced fewer stomata but more trichomes per leaf area. Because of increased trichome density it is thought auto pollution increased THC production.
Genetic diseases are common. some consequences of inbred strains are short stature (only 68% the height of normal cannabis), shortened lifespan (vegetative growth 9 weeks shorter than normal plants),production of sterile seeds, and increased susceptibility to fungal diseases. "yellow stem"disease in the genetic, caused by a monogenic recessive mutation. The gene involved has a pleiotropic effect on plant yields, it decreases biomass, fiber and seed production.
Diseases from abiotic(non-living) causes often arise suddenly. They usually resemble diseases caused by living organisms. Some abiotic diseases have unknown causes,such as "grandine" of hemp. Abiotic problems also predispose plants to other diseases. Drought-stressed plants, for instance, become much more susceptible to fungal cankers.
The most common abiotic diseases are nutrient deficiencies. Generally, deficiencies of mobile nutrients (N, P, K, Mg, B, Mb) begin in large leaves at the bottom of plants. Shortages of less mobile nutrients (Mn, Zn, Ca, S, Fe, Cu) usually begin in young leaves near the top.
Pollutants take their toll. Sulfur dioxide causes interveinal leaf chlorosis and hydrogen fluoride causes a complete chlorosis in Cannabis. Sharma & Mann (1984) found C. sativa ssp. Indica near a Himalayan highway suffering chlorosis andnecrosis. Automobile-polluted plants produced fewer stomata but more trichomes per leaf area. Because of increased trichome density it is thought auto pollution increased THC production.
Genetic diseases are common. some consequences of inbred strains are short stature (only 68% the height of normal cannabis), shortened lifespan (vegetative growth 9 weeks shorter than normal plants),production of sterile seeds, and increased susceptibility to fungal diseases. "yellow stem"disease in the genetic, caused by a monogenic recessive mutation. The gene involved has a pleiotropic effect on plant yields, it decreases biomass, fiber and seed production.