Plant Pathology - Study Mode

[#491] Muriate of potash contains
Correct Answer

(C) 60% K 2 O

Explanation

Solution: Muriate of potash contains 60% K 2 O. Potash is also referred to as Muriate of Potassium chloride and is the most widely used potassium fertilizer, potassium is one of the three primary crop nutrients required for plant growth. Potassium serves as the “Regulator” of many essential processes within the plant. Potash is water-soluble and contains 60% K 2 O.

[#492] Wilt disease of sugarcane was first time reported in India from
Correct Answer

(C) Bihar

Explanation

Solution: Wilt disease of sugarcane was first time reported in India from Bihar. This is one of the early known diseases of sugarcane in India. It was first reported by Butler and Khan in 1913, from North India in Bihar. It has been reported to cause severe damage to sugarcane crops in many parts of India. During 1965 - 1967 it caused severe damage to sugarcane crops in the Deccan plateau.

[#493] Citrus greening disease mainly confined to
Correct Answer

(A) North India

Explanation

Solution: Citrus greening disease is mainly confined to North India. Citrus greening disease is a disease of citrus caused by a vector-transmitted pathogen. The causative agents are motile bacteria, Liberibacter spp. The distribution of the Asian citrus psyllid is a vector of the citrus greening disease, is primarily in tropical and subtropical Asia. The disease was first described in 1929 and first reported in China in 1943.

[#494] The optimum temperature for the attack of foot rot of papaya (Pythium aphanidermatum) is
Correct Answer

(D) 36°C

Explanation

Solution: The optimum temperature for the attack of foot rot of papaya (Pythium aphanidermatum) is 36°C. Stem rot caused by Pythium aphanidermatum is commonly noticed in 2 to 3 year old trees. This fungal disease usually appears during the rainy season and its severity increases with the intensity of rainfall. Optimum temperature of 36°C is favourble for disease development.

[#495] The P 2 O 5 in all fertilisers comes from
Correct Answer

(C) Phosphate rock

Explanation

Solution: The P 2 O 5 in all fertilizers comes from Phosphate rock. Phosphate rock is the primary source of phosphorus (P) and the main raw material for phosphate fertilizers. Phosphate ore is extracted from sedimentary deposits (85% of world production) and magmatic deposits. Phosphate ore grades range between 2% and 35% phosphorus pentoxide (P 2 O 5 ).