International Journal of Plant Protection

Mohd. Danish ¹, Sobita Simon ¹, Hadi Husain Khan ¹

Affiliations
1 Department of Plant Protection, Sam Higginbottom Institute of Agriculture, Technology and Sciences, Allahabad (U.P.), IN

Abstract

Gram pod borer (Helicoverpa armigera) is the most serious pest responsible for higher yield losses in chickpea, cotton and red gram in India. Helicoverpa armigera is the major pest of many crops and considered as the main pest of chickpea. No plant seems to be strong enough to avoid attack of Helicoverpa armigera in affected field. Larvae of Helicoverpa armigera (Hubner) were collected from the nearby fields of chickpea. Present study was conducted to determine the susceptibility of Helicoverpa armigera (Hubner) for indigenous products and insecticide at various treatment. Seven treatments and five replication in indigenous products along with four treatment and five replication were taken up for the experiments. The data collected was analyzed using CRD design. Mortality of third instar Helicoverpa armigera (Hubner) was evalatued using tobacco leaf extract 10 per cent, Neem seed kernel extract 10 per cent, Neem leaf extract 10 per cent, cow urine 10 per cent, cow dung 10 per cent and cow urine + cow dung 5 per cent and plain water as control. The result revealed that T₁= tobacco leaf extract 10 per cent gave minimum mortality (7.37%) and T₆= Cow urine + cow dung 5 per cent gave maximum mortality (26.32%) third instar larvae Helicoverpa armigera (Hubner) and Mortality of third instar of Helicoverpa armigera was evaluated using Quinolphos 0.01 per cent, Cypermethrin 0.01 per cent and Chlorpyrifos 0.01 per cent and plain water as control. The results revealed that T₂= Cypermethrin gave minimum mortality (48.91%) and T₃ = Chlorpyrifos gave maximum mortality (77.66) third instar larvae of Helicoverpa armigera.

Keywords

Insecticides, Mortality, Helicoverpa armigera, Quinolphos.

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Hadi Husain Khan ¹, M. Shafiqansari ¹, Wajid Hasan ¹, Sumit Kumar Chauhan ¹, Mohd. Danish ¹

Affiliations
1 Department of Plant Protection, Aligarh Muslim University, Aligarh (U.P.), IN

Abstract

An attempts has been made to study the effects of insecticides i.e. 0.05 per cent aqueous solution of dimethoate and Neemarin, on the biology of Pieris brassicae (Linn.) at 25±1^oC and 70±10 per cent relative humidity through life table methods. Survivorship and Expectancy of the life was greatest in the beginning of the age and decreased gradually with the advancement of the age in the all treatment including control. The number of eggs was found less in deltamethrin (192 eggs/female/generation) as compared to neemarin (207 eggs/female/generation), and dimethoate (214 eggs/ female/generation) while it was found 281 eggs/female/generation in the control. The net reproductive rate (Ro) was also reduced with the treatment of the insecticide. Kvalues of P. brassicae was lowest on Neemarin treatment. The peak of k-value was found on Pre-pupal stage followed by Ist instar stage. It showed that Pre-pupal stage was the most susceptible stage on all treatments and non treated control.

Keywords

Dimethoate, Neemarin, Cabbage, Survivorship, Expectancy.

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Hadi Husain Khan ¹, M. Shafiq Ansari ¹, Fazil Hasan ¹, Salman Ahmad ¹, Mohd. Danish ¹

Affiliations
1 Department of Plant Protection, Aligarh Muslim University, Aligarh (U.P.), IN

Abstract

The present investigation was conducted during Rabi season of 2011 to see the effect of imidacloprid and deltamethrin insecticides on the biology of Pieris brassicae (Linn.) on cabbage at experimental field of the Department of Plant Protection, Faculty of Agricultural Sciences, Aligarh Muslim University, Aligarh. The larvae of Pieris brassicae were collected from cabbage field in the month of January and February 2012. They were kept in jars measuring 25 x15 cm and provided fresh cabbage leaves as food for larvae. These jars were kept in B.O.D chamber at 24.5^oC and 70±10 per cent relative humidity. Fresh cabbage leaves were dipped in 0.05 per cent aqueous solution of, imidacloprid and deltamethrin and dried at room temperature by keping in the experimental jars. Fifteen third instar larvae in a batch of five were allowed to feed on them for 24 hours. Survivorship and expectancy of the life was greatest in the beginning of the age and decreased gradually with the advancement of the age in the all treatment including control. The expectancy was minimum (17.18) when P. brassicae was treated with imidacloprid while maximum in the untreated individuals (25.83). The mortality of P. brassicae was significantly high in the early instars as compared to late instars in both treated and untreated individuals.

Keywords

Insecticies, Pieris brassicae (Linn.), Imidacloprid, Deltamethrin.

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