The source lists chemical treatments for thrips, nematodes, purple blotch and clove rot, and a weedicide. For nematodes it also lists the bio-agent Paecilomyces lilacinus at 2.5 kg/ha. Choose any chemical only with your local Horticulture or Agriculture Officer.
Follow the instructions on the product label. Consult your local Agriculture Officer before use.
Pending expert review
Source
Crop Production Guide – Horticulture Crops 2020 (Directorate of Horticulture and Plantation Crops, Tamil Nadu & Tamil Nadu Agricultural University (TNAU)), Garlic – Plant protection; diseases, pp. 154–155
