CONTROL OF BACTERIAL LEAF SPOT IN GRAPES

Bacterial Leaf Spot (Xanthomonas campestris) : The disease is more prevalent during June-August and again in February-March. Temperature range O of 25-30 C and relative humidity of 80-90% is favourable for the development of the disease. The young growing shoots are affected first. Disease infects leaves, shoots and berries. The symptoms appear as minute water soaked spots on the lower surface of the leaves along the main and lateral veins. Later on these spots coalesce and form larger patches. Brownish black lesions are formed on the berries, which later become small and shrivelled. Control : Collecting and burning the infected plant parts minimizes the spread of the disease. Streptocycline (500 ppm) is very effective as a prophylactic spray. Weekly sprays of copper fungicide and Bordeaux mixture given from last week of October are effective to prevent the incidence and spread of the disease.

Control of Bacterial Blight disease in Pomegranate

Bacterial blight of Pomegranate caused by Xanthomonas axonopodis pv. punicae is a wide spread disease affecting pomegranate production and quality of fruit. In-vitro evaluation of agrochemicals indicated that blitox at 3000 ppm followed by kodde 2500 ppm successfully managed the disease. A field experiment was also conducted for its management at New orchard, Punjab Agricultural University, Ludhiana during, 2013. Three sprays of the agro-chemicals were done at 15 days interval starting from end June to end July on Mridula variety of pomegranate. Among the various treatments, blitox (0.3%) + streptocycline (250 ppm) proved most effective in reducing per cent disease index, per cent fruit cracking and providing maximum disease control. Quality parameters viz., TSS, acidity, weight, pulp colour, juice weight etc. were also studied. Maximum TSS, fruit weight, juice weight, pulp weight, 100 grain weight and total grain weight were observed in blitox (0.3%) + streptocycline (250 ppm) followed by kodde (0.25%) + streptocycline (250 ppm) sprayed fruits.

CONTROL OF CITRUS CANKER DISEASE

Citrus Canker(Xanthomonas citri)  is the most serious bacterial disease of sour lime during rainy season. The disease symptoms appear on leaves, branches and fruit stalks. Canker lesions appear as yellowish spots, which gradually enlarge and appear as raised, rough brownish pustules. These pustules are surrounded by a characteristic yellow halo. Canker lesions on the fruits are confined to the rind only and do not penetrate into the flesh of the fruit. The market value of the canker-affected fruits is very much reduced. Control : Pruning and burning all the canker-infected twigs before monsoon and disinfecting the cuts with Bordeaux paint can prevent the further spread of disease. Three sprays of Streptocycline 100 ppm (10 g of Streptocycline + 5 g Copper Sulphate in 100 litres water) or Blitox (0.3%) or neem cake suspension (1 kg in 20 litres water) during February, October and December can control the disease.

CONTROL OF BACTERIAL LEAF BLIGHT(BLB) IN PADDY

Bacterial Leaf Blight(BLB) is considered as a major  threat to rice production because of its wide spread, distribution and its destructiveness under favourable conditions. The disease is caused by Xanthomonas oryzae pv. oryzae is one of the most destructive disease in irrigated and rain fed environment in Asia and cause considerable loss. Thus, a field trial was conducted during Kharif 2016 at AHRS, Bavikere to know the efficacy of different commercially available antibacterial chemicals and bio-agents against the bacterial leaf blight of rice. Results indicated that, streptocycline + copper oxychloride combined treated plots showed the lowest per cent disease incidence of 22.33 per cent. Highest grain yield of 56.49 q/ha was recorded in streptocycline + copper oxychloride, which was significantly superior over all the treatments.

Control of Black Rot disease In Cabbage Crop

Black rot disease in cabbage  can be controlled by dipping the seeds in 100 ppm Streptocycline for 30 minutes. Two sprays with 2 g/lit Copper oxychloride + Streptocycline  100 ppm after planting and head formation is recommended. 

Control of Bacterial leaf spot, blight and bacterial stem rot in Betelvine

Spray Streptocycline @ 400 ppm + Bordeaux mixture @ 0.25% at the time of first disease symptoms appear. Continue spraying at 20 days intervals.  Always spray the chemical after plucking the leaves.

MANAGEMENT OF BACTERIAL BLIGHT OF CLUSTER BEAN FOR SEED PURPOSE

Professor & Head, Department of Plant Pathology, BACA,  Anand recommends:(2011)

For effective and economical management of Bacterial blight for seed production of cluster bean farmers of middle Gujarat are advised to treat the seeds by soaking for one hour in solution of streptomycin sulphate 90% + tetracycline hydrochloride 10% (Streptocycline) 0.025% followed by three sprays of streptomycin sulphate 90% + tetracycline hydrochloride 10% (Streptocycline), 0.01% OR three alternate sprays of streptomycin sulphate 90% + tetracycline hydrochloride 10% (Streptocycline), 0.01%, followed by spray of copper oxychloride, 0.2% and streptomycin sulphate 90% + tetracycline hydrochloride 10% (Streptocycline), 0.01% starting from 35 days of sowing and at 10 days interval.