Table of Contents
What color is the streak of wheat?
yellow
Plants infected with wheat streak mosaic have a bright yellow streaking on the leaves of the plant. Symptoms are often most severe near the leaf tip.
What is streaks in plants?
Bacterial leaf streak, otherwise known as BLS, primarily affects the leaves of wheat plants but can also affect the head and the glumes of infected plants. Infection starts as water soaked streaks or spots on the surface of upper leaves that is followed by a shiny glaze.
What is wheat streak mosaic?
Abstract. Wheat streak mosaic virus is a virus that infects wheat and is transmitted by the wheat curl mite. This virus is responsible for wheat streak mosaic, a widely distributed disease of wheat that can cause economically important yield losses.
What causes leaf streak?
Bacterial leaf streak is caused by the bacterium Xanthomonas vasicola. The disease has been observed on field corn, seed corn, popcorn, and sweet corn. Symptoms of bacterial leaf streak are tan, brown, or orange lesions that occur between the veins of the corn leaves.
What is the streak color of pencil lead?
It is gray to black, opaque, has a metallic luster, and has a black streak. (Streak is the color of a mineral when it is crushed to a powder). It is an extremely soft mineral at 1 to 2 on Moh’s hardness scale. Its softness and streak make graphite useful in making “lead” for pencils.
What is Coals luster?
Most of the coal mined in the U.S. is bituminous. PHYSICAL PROPERTIES* Bituminous coal is a rock that is usually identified by how much carbon it contains rather than its physical properties, but knowing the physical properties can still be helpful. Color—Black. Luster—Dull to greasy.
How does a streak plate work?
A streak plate involves the progressive dilution of an inoculum of bacteria or yeast over the surface of solidified agar medium in a Petri dish. The result is that some of the colonies on the plate grow well separated from each other. The aim of the procedure is to obtain single isolated pure colonies.
What is kresek in rice?
In seedlings, the leaves dry out and wilt, a syndrome known as kresek. Infected seedlings usually are killed by bacterial blight within two to three weeks of being infected; adult plants may survive, though rice yield and quality are diminished.
What does the WSM virus infect?
This virus, like the WCM, has a wide host range of crops including wheat, corn, oat, barley, rye, pearl millet, and sorghum. Multiple grassy weeds also can be infected and include jointed goatgrass, grama grass, sandbur, green foxtail, barnyard grass, love grass and smooth crabgrass.
How is papaya ringspot virus spread?
Papaya ringspot disease is spread from plant-to-plant by aphids, which are small sap-sucking insects. There are many species of aphids that are capable of transmitting the virus.
What is the disease of maize?
| Bacterial diseases | |
|---|---|
| Purple leaf sheath | Hemiparasitic bacteria |
| Seed rot-seedling blight | Bacillus subtilis |
| Stewart’s disease (bacterial wilt) | Erwinia stewartii |
| Corn stunt (achapparramiento, maize stunt, Mesa Central or Rio Grande maize stunt) | Spiroplasma kunkelii |
What is plant vein clearing?
Vein clearing is the loss of normal green coloration of plant veins; usually they turn yellow first.
What causes a streak on a wheat leaf?
Bacterial leaf streak is an important disease of wheat that can reduce yield up to 40% although losses are generally 10% or less. The disease is caused by Xanthomonas translucens pv. undulosa and is widespread in areas where small grains are grown, especially in warm and humid climates or under sprinkler irrigation.
What does a wheat streak mosaic look like?
As everyone is out looking for stripe rust in their fields, wheat streak mosaic is also being found. The wheat streak mosaic is characterized by yellowing plants, with leaves that have a mottled yellow and green appearance. In many cases, the virus showing up in patterns that we are most accustomed to.
What is the vector for wheat streak mosaic virus?
The wheat curl mite, Aceria tosichella, vectors the virus in the field. It is also easily transmissible through sap by mechanical inoculation. The wheat curl mite vector feeds on young lush growth of wheat and certain grasses.
How to tell if a wheat plant has a disease?
Sudden appearance of water-soaked, light brown, elongated lesions on upper leaves; lesions quickly dry out and turn into necrotic streaks on the leaves; black stripes occur on glumes and purple black lesions appear on rachis and peduncle if infection is in the head