Microbes and Plant Diseases

Mahali disease is a serious condition affecting arecanut (betel nut) where the tender nuts dry up and fall off prematurely. It is caused by fungal pathogens and leads to significant economic losses in arecanut plantations.

Red rot of sugarcane spreads primarily through infected seed material (setts) used for planting. The fungus Colletotrichum falcatum survives in the seed pieces and infects the new crop. Air and insects are not primary transmission modes for this disease.

Bunchy top of banana is caused by the Banana Bunchy Top Virus (BBTV). It is a viral disease transmitted by aphids and causes characteristic stunting and bunching of leaves at the top of the plant.

Bacterial leaf blight in paddy (rice) is caused by Xanthomonas oryzae pv. oryzae, a bacterial pathogen. While some blights are fungal, rice blight can be bacterial, and this question specifically refers to the bacterial form.

Mushrooms are edible fungi that naturally grow in various environments and are rich sources of proteins, vitamins (especially B vitamins and vitamin D), and minerals. Neem is a medicinal plant, pine is a tree, neither are fungi.

Wilt diseases, particularly Fusarium wilt and Verticillium wilt, are classically seed-borne diseases where pathogens infect seeds and transmit to the next generation. While other diseases can also be seed-borne, wilt is most strongly associated with seed transmission in agricultural pathology.

Anthrax is a disease that affects cattle (livestock animals), while Mahali, Mosaic, and Red Rot are plant diseases affecting crops like areca nut, various grains, and sugarcane respectively. Anthrax is the odd one out as it's an animal disease, not a plant disease.

Phycobiont is the algal component. In lichens, algae and fungi live in Symbiosis i.e. they co-exist for mutual benefit.

Wheat is indeed susceptible to both mosaic and smut diseases, among others. Mosaic causes mottled patterns on leaves, while smut produces black masses of spores in the grain heads.

  Early blight of potato is caused by Alternaria solani.

Bacillus thuringiensis (Bt) is a spore forming bacterium that produces crystal proteins (Cry proteins), which are toxic to many species of insects.

Historically, kingdom Monera is divided on the basis of Gram Staining in four divisions - Firmacutes (+), Gracillicutes (−), Mollicutes (0) and Mendocutes (var.).

Rhizoids are specialized hyphae that grow downward into the substrate to anchor the fungus and absorb nutrients, similar to roots in plants. Mycelia refers to the entire network of hyphae, not just the root-like ones.

The mycelium is the vegetative part of a fungus, consisting of a network of fine white filaments called hyphae. This network forms the cottony mass often seen on bread or in soil. Sporangia are reproductive structures, while rhizoids are root-like structures used for anchorage.