Who classified plant disease epidemics into two basic types – monocyclic and polycyclic?

Given below are two statements: Assertion (A) and Reason (R). Assertion (A): Fungi is the largest microbial biomass in the soil and are very effective decomposers of plant material. Reason (R): Bacteria are the most abundant soil inhabitants and are active in decomposition of organic matter.

Peach leaf curl is caused by a

Given below are two statements: Statement I: Phytoalexins are high molecular weight compounds. Statement II: Phytoalexins are all phenolic in nature.

Stem pitting symptoms in citrus are commonly associated with –

Lyophilization in Plant Pathology is used for –

The transmission of banana bunchy top virus occurs through –

Candidatus liberibacter causes a disease in citrus plants known as –