Evaluation of efficacy of phytochemicals from invasive weeds against Dolichos bean Aphid, Aphis craccivora Koch

Kranti Waghmare, Nivedita Ghayal, Mahesh Shindikar, Rajendra Jadhav

Abstract


There are several factors that influence crop yield. Insects and weeds are one of the causative factors in crop yield reduction. The Aphis craccivora Koch is the most devastating pest of the lablab bean, affecting the crop in a variety of ways and reducing crop production. Though chemical pesticides have a measurable effect on lablab bean aphid, their substantial impact on the ecosystem is notable. In this work, invasive weeds such as Parthenium hysterophorus L. and Argemone mexicana L. were tested for insecticidal activity against lablab bean aphid using the leaf dip and film smear methods in the laboratory. The bio-efficacy of aqueous extracts (20%) of both weeds was compared to the effectiveness of the chemical pesticide Rogor (Dimethoate 0.02%). The results showed that rogor had the highest mortality, although P. hysterophorus L. outperformed A. mexicana L. in both bio-assays. The leaf dip approach showed more positive effects than film smear method. The current study implies that chemical pesticides can be substituted with bio-formulations obtained from these invasive weeds present in crop fields, which have potential to manage invasive weeds in an ecofriendly manner.


Keywords


Parthenium hysterophorus L., Argemone mexicana L., Phyto-insecticides, leaf dip method, film smear method, insecticidal activity

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