R.J. Reynolds Tobacco Company Slide Set's Images
Organization: R.J. Reynolds Tobacco CompanyUnit:
Country: United States
Web: http://www.rjrt.com/home.asp
| 4 Images of 1 Subjects | View Subject List | View Image Details | View Thumbnails |
| Image | Subject Name | Scientific Name | Description |
|---|---|---|---|
| 1402079 | herbicides (general) | Injury symptoms from dicamba and picloram are identical but tobacco is much more sensitive to pircloram. Symptoms are somewhat similar to 2,4-D. Young leaves are often strapped, while the edges and tips of the leaves curl downward, giving a "parrot-beak" or "cobra-head" appearance. A small pointed tip usually protrudes from the end of the leaf. Leaf margins are not serrated as is common with 2,4-D. Severe injury is characterized by strapped and stubby young leaves. Bud leaves are often short and stubby with rounded tips. | |
| 1440079 | herbicides (general) | Phenoxy herbicides such as 2,4-D, dicamba, and MCPA on tobacco cause symptoms which vary with the herbicide rate and the age of the affected plants. Young leaves become stiff, puckered, elongated, and often have serrated edges. Midribs of affected leaves are prominent and may extend as a pointed needle-like projection or tail at the end of the leaf. Higher dosages cause the leaves to be "strappy" in appearance. High rates may also cause extensive twisting of stalks and leaf petioles. On older plants, leaf margins will curl downward, and the midrib will bend downward. | |
| 1402077 | herbicides (general) | Injury from phenoxy herbicides, such as 2,4-D, causes symptoms that depend on herbicide rate and age of tobacco. Young leaves are puckered and stiff, with very prominent midribs. The tips and margins of the leaves are often serrated. Higher dosages cause strappy leaves with parallel veins and twisted stems. On older plants, and the midrib also bends downward. | |
| 1402082 | herbicides (general) | Injury symptoms from dicamba and picloram are identical but tobacco is much more sensitive to pircloram. Symptoms are somewhat similar to 2,4-D. Young leaves are often strapped, while the edges and tips of the leaves curl downward, giving a "parrot-beak" or "cobra-head" appearance. A small pointed tip usually protrudes from the end of the leaf. Leaf margins are not serrated as is common with 2,4-D. Severe injury is characterized by strapped and stubby young leaves. Bud leaves are often short and stubby with rounded tips. |
