Weed Control :Weeds compete with the main crop for nutrients, water and light and decrease the crop yields to a great extent. In order to control germinated narrow and broad leaf weeds, spray Targa Super @ 300 ml + Barrier @ 100 g/acre at 2-4 leaf stage of weeds.
Major Diseases and their Control
Black Scurf: The occurance of this disease is common in both hills and plains. There are two phases of this disease (i) Stem Canker Phase – The sprouts are killed before they emerge and then delays the germination resulting in loss in yield. The canker may cause wilting of the plants also, and (ii) Black Scurf Phase – Appearance of black crust on the tubes which reduces their acceptability by consumers. For its effective control, treat the potato seed with Vitavax Power @ 200 g/acre.
Method of Treating Potato Seed with Vitavax Power
Dissolve 200 g Vitavax Power in 100 litresof water and then dip the seed tubers required for 1 acre planting, for 15-20 minutes. Dry the tubers under shade and then plant or sow in the field.
Dissolve 200 g Vitavax Power in 5 litres of water and uniformly spray this solution with Knapsack sprayer on the seed tubers required for one acre planting.
Early Blight: Initially scattered brown spots appear on the leaf surface. Olderspots later on become dark brown and disease progresses upwards from the lower older leaves. For effective control of Early Blight, sprayuniformlySixer @ 250 g/acre or Kasu-B @ 400 ml + Dhanucop @ 300g/acre.
Late Blight: Late Blight, caused by fungus Phytophthorainfestans is the most important disease of potato that can result with crop failures in a short, if appropriate control measures are not adopted. Losses in potato yield can go as high as 100% in epidemic years. Small water soaked spots develop at the tips, margins or any other part of the leaf, which enlarge to form irregular dark brown lesions surrounded by a light green halo. If the weather turns dry, the lesions become necrotic and dry up. In case of infection originating from infected tubers, elongated brown strips develop on the stem below ground level and encircle it. The infected portion of the stem bear white fungal growth especially visible in early morning hours but are not as prominent on leaves. The infested tubers show irregular, shallow or sunken reddish brown patches. Inside infected tissue is spongy and rusty brown. For effective control oflate blight, spray Qurate Gold @ 600 g/acre or Kasu-B @ 400 ml + Dhanucop @ 400 g/acre uniformly.
Blackleg/ Tuber Soft Rot: The three bacteria ErwiniaCarotovora ssp.(Eca);E. Caro ssp. Carotovora(Ecc), and E. Chrysanthemi (Echr), known as the soft rot erwinias cause soft rot of potato tubers in field and store, and rotting or wilting of stems on growing potato plants often known as blackleg. In the beginning the affected plants turn pale green, yellow, wilt and finally die. The infested tubers may rot during storage also. The disease can be identified by brownish or jet black colour of the stem at the soil level. For successful control of Blackleg/Soft Rot disease, spray Kasu-B @ 400 ml/acre + Dhanucop@ 400 g/acre.