Powdery mildew of wheat is caused by species of
Puccinia
Erysiphe
Ustilago
Albugo
Ratio of $CuS{O_4},Ca{(OH)_2}$ and water in ‘Bordeaux mixture' is
Full name of $ BHC$ is
Which of the following is not used as a biopesticide?
Green manures are prepared from
What type of poison is ethylene dichloride