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I have grown castor in 5 acres, Castor is not traditionally grown in our area, but in the last two years my father has been growing this crop, because its price is high in the market.

Last year's crop was very good, but this time a new disease has occurred, the leaves of the plant have wilted. Flakes of fruits are very weak. What kind of disease is this, which is ruining my crop. Which medicine(salt) should I use to get rid of this?

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  • have you examined the underside of the leaves closely, preferably with a magnifying glass, for signs of insect or mite infestation? if not, do that, and examine the stems as well... – Bamboo Dec 10 '19 at 13:12
  • No, I don't have microscope, and there is nothing seen in magnifying glass – Praveen Yadav Dec 11 '19 at 13:26
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I'm not certain what the problem is - the puckering and wrinkling of the leaves might indicate a viral infection, but I'm not seeing any yellow bars or spots that often go along with a virus, though that particular symptom isn't always produced. If it is viral, it will get much, much worse.

It's also possible that the new leaves were nibbled/damaged by something when they were very small, before they grew and opened out properly - that would also cause distortion in the growth. That would also explain why you can't find any insect problem currently - whatever caused the damage has either already gone, or does mnot actually live on the plants. In parts of India where castor is grown as a crop, it is usually not grown as a mono crop - there is a study here https://academic.oup.com/jinsectscience/article/12/1/14/878432 with evidence to demonstrate that growing certain other plants in amongst the crop helps to significantly reduce pest problems, what's known as intercropping. Next year, don't attempt to grow a mono crop of castor - it's worth interplanting in the way suggested in the link.

  • Sir I saw again by magnifying glass, there are small insects of white colour. – Praveen Yadav Dec 12 '19 at 16:47
  • Flying insects? now you have to decide what they are - there is a whitefly that's specific to Castor plants, perhaps its that, or ordinary whitefly. Hard to say without seeing it... neem spray might help, if you are able to spray the plants. Another reason for intercropping next year... – Bamboo Dec 12 '19 at 18:03

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