Step 1: Understanding the Concept:
This matching question covers historical plant pathologists, ecological pest management (trap cropping), genetics of disease resistance, and crop-pest associations.
Step 2: Detailed Explanation:
Let us match each pair based on agricultural scientific history:
- (A) Tillet:
Mathieu Tillet published a landmark paper in 1755 showing that Stinking smut of wheat (caused by the fungus Tilletia caries/foetida) is infectious, demonstrating that dust from smutted seed can transmit the disease.
Thus, (A) matches with (II).
- (B) Growing of Tagetus (Marigold):
Tagetes (marigold) is grown alongside crops like tomato or cotton as a companion or trap crop.
Its bright flowers attract egg-laying adults of the American bollworm (Helicoverpa armigera), diverting the pest away from the main economic crop.
Thus, (B) matches with (III).
- (C) Biffen:
Sir Rowland Biffen demonstrated in 1905 that resistance to yellow rust in wheat is inherited as a Mendelian recessive character, laying the foundation for the "Genetics of plant disease resistance".
Thus, (C) matches with (IV).
- (D) Pigeon pea:
The Plume Moth (Exelastis atomosa) is a major insect pest of pigeon pea (Cajanus cajan).
Its larvae feed on buds, flowers, and developing seeds inside the pods.
Thus, (D) matches with (I).
Matching summary:
(A) $\rightarrow$ (II), (B) $\rightarrow$ (III), (C) $\rightarrow$ (IV), (D) $\rightarrow$ (I).
Step 3: Final Answer:
The correct option is (A).