My okras have been doing exceptionally well but one day after i sprayed them with epsom salts and water they suddenly had holes on their leaves from some disease or insect damage. I have only observed some black spots and some sprinkling of black stuff underneathe their leaves. Initially i thought it was aphids as some of the new growths are crinkling and i brewed some water infused with garlic and cayenne powder and sprayed. Its been 4 days and i suppose it hasnt gotten worse. But i'm not too sure. Help please!