| [ Music ] | Text on screen reads, how to identify foliar symptoms of bacterial diseases in onion. When and where to look for symptoms on an onion plant. |
| [ Music ] | An image of the green leaves of an onion plant sticking out of the soil after the bulb has been planted in the ground. Text reads, leaf symptoms of bacterial disease usually appear after onions start bulbing, although leaf symptoms may occur in younger plants, too. |
| [ Music ] | An image of the leaves of an onion plant, with one part highlighted where the leaf has become dry and pale. Text reads, at first, bacterial disease usually appears on a single middle aged leaf. Not usually in the youngest leaves of the onion plant, not usually in the oldest leaves of the onion plant. |
| [ Music ] | An image of the leaves of an onion plant, where some parts of the leaf in the middle have become dry and discolored. Text reads, next, bacterial disease might appear in the opposite middle aged leaves of the onion plant. Next, all middle aged and young leaves might collapse while outer leaves remain healthy. An image of onion leaves that have bent and collapsed in the middle, folding over toward the ground. |
| [ Music ] | An image of a dead onion plant, with collapsed and discolored leaves. Text reads, eventually, the whole plant might collapse and die. Bacterial diseases of onion can spread down the leaves, into the neck and into the bulb. An image of a rotting onion bulb. |
| [ Music ] | Text reads, not all plants with foliar symptoms will result in bulb rot. New slide titled, common leaf symptoms of bacterial diseases. Text reads, onion leaves infected with bacteria can be white in color, brownish gray, pale green or yellow. An image of onion leaves that have collapsed and turned white. Then, similar images of leaves that have turned brown, pale green and yellow. |
| [ Music ] | An image of onion leaves that look wet and mushy. Text reads, infected leaves can look water soaked or dry and necrotic. Very early foliar symptoms appear as a white spot extending from the leaf axil. An image of onion leaves with white spots at the bottom near the bulb. |
| [ Music ] | An image of onion leaves with holes and rips in them. Text reads, bacteria may enter mechanical wounds, such as those caused by hail, and cause disease extending from the wounds. An image of onion leaves with black stains on them. Text reads, sometimes, collapsed leaves are invaded by secondary fungi with dark colored spores. |
| [ Music ] | New slide titled, tips for field scouting. A video of onion leaves in a field, zooming in on thin white leaves sticking out from healthier ones. Text reads, look for white leaves. Keep an eye out for plants with collapsed inner leaves. A video of a woman picking up an onion plant and pointing to the collapsed leaves. |
| [ Music ] | Text continues. Bacterial disease is often randomly distributed in the field. Hot spots can occur, such as areas where the soil is wet. An image of water logged soil in a field. New slide titled, lookalikes. |
| [ Music ] | Text reads, iris yellow spot virus can also cause leaf collapse. An image of onion leaves that have collapsed and turned a brown yellow color, and a video of leaves with white spots on them. Text reads, look for white or greenish elongated lesions on mid aged leaves in plants infected by I Y S V. An image of onion leaves with bacterial disease, showing pale collapsed leaves, alongside an image of onion leaves with I Y S V, with white spots on them. |
| [ Music ] | Text reads, fusarium basal rot, F B R. F B R usually causes leaves to die back uniformly, unlike bacterial diseases. An image of onion leaves with F B R, where a group of leaves have collapsed together. An image of an onion bulb, showing dryness and rot at the roots. Text reads, to confirm F B R, look for poor roots and a rotting basal plate. An image of an onion bulb with brown spots on the bottom. Text reads, corky basal plate rot. Another image of an onion with brown discoloration at the neck. Text reads, slimy rot coming from neck. |
| [ Music ] | An image of an onion bulb with white shoots coming out of it, surrounded by brown discoloration and dark spots. Another image of an onion bulb with pink roots coming from the neck. Text reads, anything that damages the basal plate or roots can cause leaf die back, such as a split basal plate or pink root. |
| [ Music ] | The logo for Allium Net. Text reads, for more information, visit allium net dot com. The logo for the United States department of agriculture, nature's ninja, and stop the rot. Text reads, Cornell cooperative extension, Cornell vegetable program. |
| [ Music ] | Cornell University logo. Text reads, Cornell University Founded A D 1865 |