Agriculture
For nearly 70 years after viruses were discovered, many plant diseases were described that showed symptoms of general yellowing or reddening of the plant or of shoots proliferating and forming structures that resembled witches? brooms. These diseases were thought to be caused by viruses, but no viruses could be found in such plants. In 1967, Doi and colleagues in Japan observed mollicutes, i.e., wall-less mycoplasma-like bodies in the phloem of plants exhibiting yellows and witches? broom symptoms. That same year the same group showed that the mycoplasma-like bodies and symptoms disappeared temporarily when the plants were treated with tetracy-cline antibiotics. Since then, mycoplasma-like organisms (MLOs) that infect plants have been reclassified as phy-toplasmas, and some of them that have helical bodies and can be found in other environments besides plants are known as spiroplasmas.
- Viruses And Viroids
Viruses are extremely small parasites that have none of the structures characteristic of living cells. Many viruses are little more than a protein-coated and particle-containing DNA or RNA. The protein coat is specifically adapted for breaching the plasma...
- Pepper Plant Blight: Information For Controlling Phytophthora On Peppers
By Kristi Waterworth The soil is full of living things, some useful, like earthworms, and others not as useful, like the fungi in the genus Phytophthora. These irksome pathogens can last long after infected plants have composted into nothing, continuing...
- Establishing The Cause Of Disease
Source: agriculture/agriculture-564edeb1c9088.jpgThe correct diagnosis of a plant disease and its cause is not always an easy task. In the first instance symptoms may be ill defined which make their association with any organism problematic (Derrick and...
- Plants Invisible Enemies
Plants, through their ability to fix carbon dioxide by photosynthesis, are the primary producers of the food that feeds the world?s human population as well as the many animals and other organisms that are heterotrophic for carbon compounds. It is not...
- Fruit And Vegetables Treated With Pesticides Can Cause Parkinson's Disease
Fruit and vegetables treated with pesticides can cause Parkinsons, say scientists from the German University Clinic Carl Gustav Carus. The researchers came to this conclusion after extensive testing with mice. In Germany alone 400,000 people are suffering...
Agriculture
Mollicutes (Phytoplasmas)
For nearly 70 years after viruses were discovered, many plant diseases were described that showed symptoms of general yellowing or reddening of the plant or of shoots proliferating and forming structures that resembled witches? brooms. These diseases were thought to be caused by viruses, but no viruses could be found in such plants. In 1967, Doi and colleagues in Japan observed mollicutes, i.e., wall-less mycoplasma-like bodies in the phloem of plants exhibiting yellows and witches? broom symptoms. That same year the same group showed that the mycoplasma-like bodies and symptoms disappeared temporarily when the plants were treated with tetracy-cline antibiotics. Since then, mycoplasma-like organisms (MLOs) that infect plants have been reclassified as phy-toplasmas, and some of them that have helical bodies and can be found in other environments besides plants are known as spiroplasmas. - Viruses And Viroids
Viruses are extremely small parasites that have none of the structures characteristic of living cells. Many viruses are little more than a protein-coated and particle-containing DNA or RNA. The protein coat is specifically adapted for breaching the plasma...
- Pepper Plant Blight: Information For Controlling Phytophthora On Peppers
By Kristi Waterworth The soil is full of living things, some useful, like earthworms, and others not as useful, like the fungi in the genus Phytophthora. These irksome pathogens can last long after infected plants have composted into nothing, continuing...
- Establishing The Cause Of Disease
Source: agriculture/agriculture-564edeb1c9088.jpgThe correct diagnosis of a plant disease and its cause is not always an easy task. In the first instance symptoms may be ill defined which make their association with any organism problematic (Derrick and...
- Plants Invisible Enemies
Plants, through their ability to fix carbon dioxide by photosynthesis, are the primary producers of the food that feeds the world?s human population as well as the many animals and other organisms that are heterotrophic for carbon compounds. It is not...
- Fruit And Vegetables Treated With Pesticides Can Cause Parkinson's Disease
Fruit and vegetables treated with pesticides can cause Parkinsons, say scientists from the German University Clinic Carl Gustav Carus. The researchers came to this conclusion after extensive testing with mice. In Germany alone 400,000 people are suffering...