Plant Bio-chemicals against Helicoverpa armigera (Hübner): A Study in Tomato

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Plant Bio-chemicals against Helicoverpa armigera (Hübner): A Study in Tomato

June 19, 2021 Agricultural Sciences 0

The mechanism of host plant resistance in tomato varieties was evaluated and compared to the attack of the tomato fruit borer, Helicoverpa armigera (Hubner), in the Solan district, known as the “Tomato Bowl of Himachal Pradesh.” Understanding the mechanisms of induced resistance allows us to predict which pests will be affected by induced responses. Induced response elicitors can be sprayed on crop plants to strengthen the natural defense system against herbivore damage. Three self pollinating indeterminate varieties developed by selection (Solan Lalima, Solan Vajar, and Palam Pink) and four hybrids (Naveen 2000+, Heem Sohna, and Palam Pink) were used in the experiment. Researchers extracted various macro and micronutrients from the foliage of these varieties, as well as estimating the chemical composition of tomato fruits, such as total phenols, titrable acidity, reducing sugars, and total sugars, to compare for different levels of resistance to Helicoverpa armigera. Fruit infestation was found to be inversely related to phenol and sugar content in tomato fruits, as measured by correlation coefficient values (r= -0.895) and (r= -0.650), respectively, indicating that less susceptible varieties were high in phenols and sugars, protecting them from pest attack. Nitrogen (r= 0.660), potassium (r=0.679), magnesium (r=0.698), and iron (r= 0.547) are all related. Phosphorus (r= -0.857) and zinc (r= -0.801) content were found to be positively correlated with percent fruit infestation, whereas manganese (r=0.546) content was found to be negatively correlated with percent fruit infestation. This resistance can be used to create crop cultivars that rapidly produce the inducible response in the face of a mild infestation, and it can be used as an important component of integrated pest management alongside other techniques such as biological, cultural, and chemical control.

Author (s) Details

Priyanka Thakur
Department of Entomology, Dr Y S Parmar University of Horticulture and Forestry, Nauni – 173230, HP, India.

R. S. Rana
Department of Entomology, Dr Y S Parmar University of Horticulture and Forestry, Nauni – 173230, HP, India.

K. C. Sharma
Department of Entomology, Dr Y S Parmar University of Horticulture and Forestry, Nauni – 173230, HP, India.

Nalini Challa
Department of Entomology, Dr Y S Parmar University of Horticulture and Forestry, Nauni – 173230, HP, India.

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