Answer Posted / swapna
On leaves, young infections are very small, greenish-
yellow, translucent spots that are difficult to see. With
time the lesions enlarge, appearing on the upper leaf
surface as irregular pale-yellow to greenish-yellow spots
up to 1/4 inch or more in diameter. On the underside of the
leaf, the fungus mycelium (the "downy mildew") can be seen
within the border of the lesion as a delicate, dense, white
to grayish, cotton-like growth. Infected tissue gradually
becomes dark brown, irregular, and brittle. Severely
infected leaves eventually turn brown, wither, curl, and
drop. The disease attacks older leaves in late summer and
autumn, producing a mosaic of small, angular, yellow to red-
brown spots on the upper surface. Lesions commonly form
along veins, and the fungus sporulates in these areas on
the lower leaf surface during periods of wet weather and
high humidity.
| Is This Answer Correct ? | 7 Yes | 3 No |
Post New Answer View All Answers
Where would you find a tormogen cell?
What factors affect soil permeability? : soil science
Do needles appear to be mottled, turning yellow to brown?
Where is gypsum found? : soil science
which group of hosts deposit gums to defend themselves?
John Henry Comstock's taxonomic specialty was with what family if insects?
Can you provide insights into the application of data analytics and modeling in optimizing agricultural operations and decision-making?
What is the difference between sand and silt? : soil science
What popular journal did C. V. Riley and B. D. Walsh begin in 1868?
In what order of insects would you find hamuli?
Is it better, to kill the black alkali in the soil with gypsum, just to scatter it over an alkalied spot or to plow the soil first and then use the gypsum if you are going to sow alfalfa?
What is green revolution?
Describe your familiarity with relevant software tools used in agricultural engineering, such as simulation programs or modeling software.
What types of crops are generally grown in india?
How will agricultural tariffs be reduced in the doha round?
