Agriculture is the back bone of economy in many countries but; attack of pathogens and insects can cause serious losses. Due to environmental pollution and negative impacts on health of chemicals; scientists are focusing on more natural control including botanical insecticides. They possess insecticidal activity, repellence to pests, antifeedancy, insect growth regulation, toxicity to nematodes, mites, snail and slugs and other pests. These botanical insecticides also exhibit antifungal, antiviral and antibacterial characteristics against pathogens. Bio pesticides have gained the attention of experts to cope with nematodes issues in an eco-friendly way1.
French marigold (Tagetes patula L.) is a multifunctional plant having ornamental, ritual, medicinal, anthelmintic, insecticidal, colorant, food and forage uses2. Especially, flowers and entire herb of this plant are utilized to manufacture ethno-botanical medication against rheumatism, stomach and intestinal disorders, kidney and hepatic ailments, fever and pneumonia3. Marigold has been used against nematodes for over 50 years4. Moreover, it was also reported that Tagetes possess fungicidal activity against Helminthosporium oryzae 5. A variety of Tagetes oils own inhibitory action for Gram-positive bacteria and fungi6.
Tomato is a important horticultural crop and many experiments have been done against causal organism affecting this plant. Accordingly; Gayatri Nahak and Rajani Kanta Sahu performed a research to evaluate the effectiveness of aqueous flower extract of marigold to manage diseases like canker, early blight, fruit spot, blossom end rot, wilt and sun scald in tomato plant and its impact on growth and yield as well. In this experiment spaying technique was used to evaluate potential of merigold on tomato plants on weekly basis and the information of growth, yield and disease of tomato plants was collected from 10th day onwards under field circumstances.
Scientists noted that the crude extract of merigold obtained by using water as a solvent; is a valuable against a range of diseases of tomato plants. This experiment proved the bio efficacy characteristic of this plant because of reduction in disease level and enhancement in growth and yield tomato under field condition. Scientists stated that: “based on the results from this study, we are planning to undertake a field-based experiment to evaluate Tagetes patula L., insecticidal activity against not just tomato but the whole insect herbivore complex of other commonly grown vegetables in India.” This research exhibited that botanicals are most capable source of bio active products because they are economical, feasible and environmentally safe. It will also pave a way for the conservation of biodiversity maximum production of healthy food commodities.
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17 November, 2019