The crop is of 40-45 days old at farmers fields. The farmers have applied two different unapproved combinations of herbicides and insecticides. First unapproved combinations was application of Atrazine @ 5.0 kg +2,4- D amine 1250 ml/ ha ( products dose) herbicide in 40 Days old crop in standing water of about 10 cm. Another unapproved combinations was application of Thio+phorate+carbendazim in plant and ratoon crop. Can anyone help me in distinguishing the exact cause of these symptoms.?
Hello Dr. Chand,
Either bacterial stripes caused by strains of Buckholderia or anthracnose leaf blight brought about by Colletotrichum sp. These are my guesses. At first appeared like rust but upon closer inspection it appeared that may not be the case here.
Regards,
Dr. Abhishek Mukherjee
Red rot symptom commonly observe on mid rib of leaf. The attached leaves showing the severe symptom which is most probably red rot symptom. It may be further confirmed by simple microscope by scrubbing the spot with a blade and put on slide with small drop of water. Hope the conidia of Glomerella tucumanensis may seen.
I think the chlorosis and necrosis symptoms might be due to Zinc (Zn) deficiency. I will strength this argument later...
The problem reported by picture seems Bacterial Leaf Streak caused by Xanthomonas vasicola pv. vasculorum (synonym X. campestris pv. zeae) ( https://cropwatch.unl.edu/bacterial-leaf-streak ), OR this might be due to micro nutrient defficiency. Such problems in open field are due to different overlapped environmental effects; biotic and abiotic effects. So, to come into conclusion, it is necessary to investigate at spot and also in laboratory.
Thank you!
Accoriding to my opinion it may be Red rot of sugarcane as brikish red lesion apperas on midrib region too, but after diagnosis we can confirmed.
The crop is now recovering fast. These symptoms were probably due to toxicity of chemical combinations. The farmers were advised to apply two frequent flood irrigation. Due to dilution and leaching of the chemical with heavy irrigation, the crop is now recovering. There is no further spread of toxicity after these irrigations.
It may be red strip disease of sugarcane caused by bacteria. The symptoms appear mostly during May, June. 0.01% of streptocyclin may be used as foliar spray.
Yeah, of course whenever we observed something strange on our plants, it is very advisable to investigate if the problem will continue or if it will be averted by simple application. So, investigate from different angle before application of different trearment. Irrigation is very suitable action which can bring significant change like the one you observed. So, congrats for your sugarcane come back to normal.
Sovit Parajuli, currently growth and maturation phase in both spring and autumn planted cane is going on so I believe sucrose concentration would not be affected by irrigation as the accumulation will take place later.
Thanks @Sovit Parajuli for your comments. As stated by Dr. Priyanka Singh also , the crop is in establishment or formative phase, there will be no adverse effect on sucrose concentration.
Now the crop is fully recovered from toxicity. Crop is lush green with excellent tillering and growth.
Dear Mehar Chand, Thank you for sharing the updates. It is very useful information!
Thanks @ Girma Hailemichael for your support and new idea to minimize the toxicity symptoms on crop plants.
Nice to note, that with a bit of efforts on R and D, solution has been evolved. Full credits go to your humble team work in this issue.
Kudos to @ Dr Mehar Chand in raising the details of the problem, and initiation by @ Girma H and others @ SovitP, @ Priyanka .. Well wishes.
Dear Dr. Mehar Chand
Although it has been a long time since the questions and answers, I felt the need to explain this. These symptoms, which are seen in early seedlings, are not due to the disease or lack of nutrients mentioned by some loved ones, depending on your local conditions. This condition, as you mentioned, is due to the effects of contact toxins or the misuse of surfactants. This phenomenon is not recovered, but is generally not seen in new leaves, and its effects remain on damaged leaves. Contact toxins after absorption at the contact site cause irritation and necrosis and are not seen in other parts or new leaves.
Yours sincerely
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