Botanical extracts reduced Hellula undalis in cabbage, indicating A. indica may enhance marketable yield.
The investigation was conducted at Navsari Agricultural University, Navsari, Gujarat during rabi 2021-22. All the botanical extracts Adhatoda vasica L., Azadirachta indica A. Juss, Lantana camara L., Annona squamosa L., Jatropha curcas L., Andrographis paniculata L., Datura metel Damro, Ocimum basilicum L. and Melia dubia Kadbevu, were found to be effective against Hellula undalis Fabricius. Among them, A. indica extract was found to be the most effective which was at par with L. camara and A. paniculate. Whereas, J. curcas was the least. However, there was no significant difference in the number of coccinellids between the treatments after two spray applications of aqueous leaves extracts indicating the low or negligible side effects of botanicals to beneficial insects. Furthermore, the maximum yield of marketable heads was obtained from plots treated with A. indica extract and the minimum yield was recorded in J. curcas treated plots but was significantly superior over control.
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Bharodiya et al. (2024) studied this question.