Mani Devi

Tamil Nadu Agricultural University | TNAU · Department of Agricultural Entomology (Coimbatore)

The parasitism efficiency through sexual and parthenogenesis reproduction and emergence rate of nine different egg parasitoids belong to the Genus Trichogramma viz., T. pretiosum, T. embryophagum, T. achaeae, T. japonicum, T. brassicae, T. mwanzai, T. chilonis, T. dendrolimi and T. evanescens on the eggs of Brinjal Shoot and Fruit Borer, Leucinodes...

The brinjal shoot and fruit borer, Leucinodes orbonalis is a destructive pest of brinjal and its control is difficult as the larvae inhabited inside the shoots or fruits of brinjal. Two different studies were conducted in farmer’s field at Coimbatore, Tamil Nadu, India during Rabi 2013/14 (September, 2013 – January, 2014) and 2014/15 (September, 20...

Field experiments were carried out during the seasons Rabi 2014/15 at Alandurai, Thondamuthur, Coimbatore, Tamil Nadu, India to evaluate the efficacy of ten insecticides viz., Imidacloprid 17.8% SL, Thiacloprid 21.7% SC, Thiodicarb 75% WP, Chlorantraniliprole 18.5% SC, Flubendiamide 20 WG, Emamectin benzoate 5 SG, Diafenthiuron 50 WP, Spinosad 2.5%...

Six strains of Beauveria bassiana were isolated from different sources collected from different places of Tamil Nadu and tested their efficacy under laboratory condition against crawler stages of papaya mealybug by insect dip bioassay method. The results revealed that B. bassiana strains, UPI (Bb) and ANR (Bb) were recorded the lowest LC50 values o...

Screening of jasmine, mango and mulberry varieties/cultivars/ecotypes/biotypes revealed that the mite infestation ranged from 0 to 100 per cent in jasmine, 60 to 80 per cent in mango and 10 to 100 per cent in mulberry and the mean mite population varied from 0.5 to 16 mites/leaf with a highest mean mite population of 16 mites/leaf in Jasminum auric...

The sweet potato weevil, Cylas formicarius, constitutes a major constraint to sweet potato production and utilization in Africa. Host plant resistance/tolerance, mulching and varying harvesting dates could provide an approach that fits well into an integrated pest management programme of this insect pest. In this study, a trial was conducted to eva...

The parasitism efficiency of the egg parasitoid, Trichogramma ernbryophagum on one-nt'o-and three-day olrl eggs of Leucinodes qrbonalrs was studied under laboratoly condition dr.rring three different seasons. The emergence rate of T. embryophagum fiom parasitized dift'erent aged eggs of L. orbonalis and the parasitizing abilify of T. embryophagum t...

The parasitizing efficiency and emergence rate of the egg parasitoids, Trichogramma pretiosum and Trichogramma chilonis on one-day, two-day and three-day old eggs of Leucinodes orbonalis was studied under laboratory condition during three different seasons at The parasitizing ability of T. pretiosum reproduced through parthenogenesis reproduction i...

The field trial was conducted on different newer insecticides with neem oil against Aceria jasmini in Jasminum auriculatum two sprays were given at fifteen days intervals. Amongst the treatments in first spray, the propargite @ 0.5 ml/l effectively reduced the mites population preceded by abamectin @ 0.3 ml/l and neeem oil @ 30 ml/l. In second spra...

A field experiment was conducted to study the field efficacy, net profit and cost benefit ratio of certain insecticides against fruit borer, Helicoverpa armigera (Hubner) in tomato during Rabi season 2008. The pooled and statistical data indicated that spraying of endosulfan 35 EC was found to be most effective as it recorded lowest larval populati...

The life stages of Cylas formicarius in sweet potato tubers were assessed during first and second generations. In first generation, the highest egg period was recorded in Co-3 (White) (5.50 days). The lowest larval period was recorded in Kanjangad (24.16 days) while highest pupal period was recorded in Kanaka (Red) (7.56 days) and the total life cy...