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manjula, T. R.
- Occurrence of Papaya Mealybug, Paracoccus marginatus Williams and Granara De Willink (Hemiptera:Pseudococcidae), on Cotton
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Authors
Affiliations
1 Department of Entomology, Central Institute for Cotton Research, Regional Station, Coimbatore 641003, Tamil Nadu, IN
1 Department of Entomology, Central Institute for Cotton Research, Regional Station, Coimbatore 641003, Tamil Nadu, IN
Source
Journal of Biological Control, Vol 23, No 3 (2009), Pagination: 321-323Abstract
The papaya mealy bug, Paracoccus marginatus Williams and Granara de Willink, was recorded in severe form on cotton in Coimbatore in 2008-09. Infestation leads to drying of the sympodial branches and both Bt and non-Bt cotton hybrids have been observed to be infested. Spalgis epius (Westwood) (Lepidoptera: Lycaenidae) was recorded as a predator on P. marginatus infesting cotton and other hosts like papaya, silk cotton, subabul, Ixora sp., Crotons, Gliricidia sp. and Hibiscus sp. The larvae of S. epius were found to be voraciously feeding on the egg masses, nymphs and adults of the mealybugs.Keywords
Cotton, Papaya Mealybug, Paracoccus marginatus, Spalgis epius.Full Text
References
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- Field Efficacy of Pseudomonas fluorescens against the Cotton Leaf Hopper, Amrasca devastans Distant (Hemiptera:Aphididae) in Bt and Non Bt Cotton
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Authors
Affiliations
1 Department of Entomology, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi (T.N.), IN
2 The Gandhigram Rural Institute - Deemed University, Gandhigram, Dindigul (T.N.), IN
3 Department of Entomology, Tamil Nadu Agriculture University, Coimbatore (T.N.), IN
1 Department of Entomology, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi (T.N.), IN
2 The Gandhigram Rural Institute - Deemed University, Gandhigram, Dindigul (T.N.), IN
3 Department of Entomology, Tamil Nadu Agriculture University, Coimbatore (T.N.), IN
Source
Agriculture Update, Vol 12, No 4 (2017), Pagination: 706-713Abstract
An experiment was conducted to evaluate the efficacy of Pseudomonas fluorescens against leafhopper of Bt cotton and non Bt cotton in two location of Vanavarayar Institute of Agriculture, Pollachi and South Indian Millers Association, Udumelpet. Seven treatments i.e. foliar application of P. fluorescens @1%, soil application of P. fluorescens 2.5 kg/ha, soil and foliar application of P. fluorescens @1%, foliar application of P. fluorescens @1% and Beauveria basianna @ 1%, foliar application of Beauveria basianna @ 1%, imidacloprid 200 SL @ 200ml/ha and Untreated check were evaluated. Among the bio inoculants treatment the maximum per cent reduction in leafhopper population with a mean of 71.00; 83.45; 85.01 and 63.28; 82.32; 91.58 at 1st, 2nd and 3rd spray after application in both the locations respectively in Bt cotton during 2013-14. The similar trend was also observed in non Bt cotton. During 2014-15, the maximum per cent reduction in leafhopper population recorded among the bio inoculants treatment, the soil and foliar application of P. fluorescens @1% in two locations and both bt and non Bt cotton. The highest mean seed cotton yield was obtained in soil and foliar application of P. fluorescens @1% in two locations, and both years of 2013-14 and 2014-15.Keywords
Bioefficacy, Biopesticides, Pseudomonas fluorescens, Bt Cotton, Non Bt Cotton, Leafhopper.
References
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- Field Efficacy of Pseudomonas fluorescens against the Cotton Aphid, Aphis gossypii Glover (Hemiptera:Aphididae) in Bt and Non Bt Cotton
Abstract Views :218 |
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Authors
Affiliations
1 Department of Entomology, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi (T.N.), IN
2 The Gandhigram Rural Institute - Deemed University, Gandhigram, Dindigul (T.N.), IN
3 Department of Entomology, Tamil Nadu Agriculture University, Coimbatore (T.N.), IN
1 Department of Entomology, Vanavarayar Institute of Agriculture, Manakkadavu, Pollachi (T.N.), IN
2 The Gandhigram Rural Institute - Deemed University, Gandhigram, Dindigul (T.N.), IN
3 Department of Entomology, Tamil Nadu Agriculture University, Coimbatore (T.N.), IN
Source
Agriculture Update, Vol 12, No 4 (2017), Pagination: 720-728Abstract
The cotton aphid, Aphis gossypii Glover (Hemiptera: Aphididae), is a key pest of cotton, irrespective of the use of conventional or organic management. In organic systems, however, the use of synthetic insecticides is not allowed, increasing the difficulty of controlling this pest. This work evaluated aphid control and the ability of products to prevent aphid infestation using entomopathogenic bacteria, Pseudomonas fluorescens compared to a standard synthetic insecticide. The trial was conducted with entomopathogenic fungi, Beauveria bassiana and untreated plants served as the control group. The trial testing the efficacy of P. fluorescens in preventing aphid infestation was conducted using the same products. The evaluations were conducted pre and post-treatment of three round of application for the efficacy and the protection against colonization trials, respectively. The lowest aphid populations recorded by the bio inoculant treatment of the soil and foliar application of P. fluorescens @1%. Regarding the plant protection against aphid colonization, the insecticide imidacloprid exhibited a better performance compared to the other tested products with steady results over the evaluation period. The other treatments exhibited variable results with protection against aphid colonization throughout the evaluation period.Keywords
Cotton Aphid, Pseudomonas fluorescens, Alternative Control, Bt Cotton, Non Bt Cotton.References
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