At the turn of the century, blister blight proved to be a severe and crippling concern for planters in Assam.
Samuel Peal is also reported to have written on the blister blight of tea as far back as 1868 but this source remains untraced; quoted in Harold H Mann, 'The Blister Blight of Tea', Indian Tea Association Circulars, No.
Mann, The Blister Blight of Tea, Indian Tea Association Circular No.
Whilst this took care of some of the nutrition requirements of the tea bush, shade regulation helped in minimizing Blister Blight, and an additional bonus was discovered when it was noticed that the Neem cake being applied to the soil was acting as a repellent to the mite.
While their use may be in the area of rhizosphere, their application for foliar diseases such as Blister blight, for which 35-37 sprays are in vogue in India, may be useful provided that we have the right type of organisms and also the formulation which will kill the spore before it enters, and therefore effectively reduce the sporulation.