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Consider the following four measures $(I-I V)$ that could be taken to successfully grow chickpea in an area where bacterial blight is common.
$I.$ Spray with Bordeaux mixture.
$II.$ Control of the insect vector of the disease pathogen.
$III.$ Use of disease-free seeds only.
$I V$. Use of varieties resistant to the disease.
Which of the above measures can control the diseases?
$I, I I$ and $I V$
$I, I I I$ and $I V$
$I I, I I I$ and $I V$
$I, I I$ and $I I I$
Solution
Bacterial blight of chickpea is caused by bacterium Xonthomonas campestris. The stem and the leaves of infected plant give blighted or burnt up appearance. Control measures include roguing, $3$ – years crop rotation, disease-free seeds, spray of copper fungicides (Bordeaux mixture) and antibiotics besides sowing disease resistant varieties.
