Lemon tree. Whitish patches to the trunk, Lemon fruits becoming pale& brown colored, becoming like dried ,hard, Leaves also falling, like less dense leaves.

Thank you for your response!! Would you please suggest any pesticide that would solve the problem along with its dosage.

Hi. Thanks for visiting the Plantix community. I think that's Unaspis citri, known generally as citrus snow scale.

For control, you can apply mineral oil, emulsifiable vegetable oil or insecticide based on neem seed extract.