Papers by ARAVINTHRAJU K
Research Article, 2019
Okra Abelmoschus esculentus L. (Moench), an important vegetable crop grown in tropical and sub-tr... more Okra Abelmoschus esculentus L. (Moench), an important vegetable crop grown in tropical and sub-tropical parts of world. Where India ranks first in its production. It’s an important component of human diet, as it is rich in many nutrients. Also it is used in medical industry, paper industry, preparation of brown sugar, etc. But reduction in yield of Okra is noticed widely, due its pests and diseases. In which cotton Mealybug, Phenacoccus solenopsis Tinsley (Hemiptera: Pseudococcidae) gaining more importance in agricultural and horticultural crops including okra. For controlling this pest many insecticides are used by farmers, which are also harmful to environment. Hence botanical control of pests is gaining importance now a days. Here for testing bio-efficacy two botanicals namely, Knicker nut (Caesalpinia bonducella) and Tulsi (Ocimum sanctum) leaves of different concentration viz, 1%, 2%, 4%, 8% and 10% in methanol, ethanol and aqueous solvents were tested against Phenacoccus solenopsis for percent mortality and repellency at 12, 24, 48 hours in laboratory condition. In which 10% ethanol extract of O. sanctum at 48 hours shows 100% mortality and the highest percent repellency recorded was in the treatment with 10% ethanol extract of C. bonducella (97.56%) at 48 h
Research Paper, 2020
Pulses, a poor man’s meat in which many insect pests causes losses in both field and storage cond... more Pulses, a poor man’s meat in which many insect pests causes losses in both field and storage condition. In storage condition, the pulse beetle, Callosobruchus spp. causes major losses among other Pests. The present study involves the evaluation of certain botanicals like Neem leaf powder 5g/ 100 seeds, Nimbicidin 5ml/ 100 seeds, Karanji oil 5ml/ 100 seeds, Custard apple leaf powder 5g/ 100 seeds, Castor oil 5ml/ 100 seeds and Eucalyptus oil 5ml/ 100 seeds against C. chinensis in chick pea for percent seed infestation and percent seed weight loss, where Deltamethrin (2.8 EC) 0.04ml/ 100 seeds and untreated treatments used as standard check and untreated check respectively. The results revealed that all the treatments was significantly superior then the untreated control that have maximum insect damage (9.0%) at 30 days of storage period. Insect infestation percent was increased in all the treatments with period increased in storage and nature of protectants. Minimum percent infestation and percent weight loss were noted in Deltamethrin (2.8 EC) 0.04ml/ 100 seeds followed by Nimbicidin 5ml/ 100 seeds and highest were in untreated control.
Research Article, 2021
A study on efficacy of certain insecticides against guava tea mosquito bug Helopeltis antonii Sig... more A study on efficacy of certain insecticides against guava tea mosquito bug Helopeltis antonii Signoret was carried out at the farmer’s fields in Andipatti and Natham. It was observed that clothianidin 50%WDG @ 120 g/ ha was the most effective giving 83.75% reduction over control. Buprofenzin 25%SC @1000 ml/ ha, and thiacloprid 21.7%SC @500 ml/ ha were the next and on par with each other. Thiamethoxam 25%WG @100 g/ ha, profenophos 50EC @250 ml/ ha, spinosad 45%SC @750 ml/ ha and emamectin benzoate 5%SG @ 500 g/ ha were observed to be less effective.
Conference Presentations by ARAVINTHRAJU K
Presentation, 2022
The genus Helopeltis, commonly known as Tea Mosquito Bugs (TMB), is a group of Heteropterans in t... more The genus Helopeltis, commonly known as Tea Mosquito Bugs (TMB), is a group of Heteropterans in the family Miridae (capsid bugs). It is a major pest of tea, and also a major threat to cashew, Acacia, cocoa, camphor, pepper, cardamom and now noticed as emerging pest in guava. The nymphs and adults insert their proboscis into the young leaves, buds, tender shoots, inflorescence and fruits to suck the plant sap. For the management of TMB, farmers mainly depend on insecticides which led to many problems like elimination of natural enemies, emergence of secondary pest, resistance development to insecticides in TMB, resurgence and accumulation of residues in guava fruits. Hence, two field trials were carried out during 2019-2020, to access the efficacy of bio-rationales against tea mosquito bug (TMB), Helopeltis antonii Signoret on guava in the farmer’s fields at Andipatti (9.99508° N latitude, 77.66715° E longitude) and Natham (10.20284° N latitude, 78.15778° E longitude), Tamil Nadu, India. Regardless of the locations, tea mosquito bug population reduction in Lecanicililum lecanii 106 CFU/ L at 5g/ ml was higher, followed by Metarhizium anisopliae 108 CFU at 8g/ L, Azadirachtin 10,000 ppm at 2ml/ L, NSKE 5% and pungam oil 3% whose efficacy were moderate against tea mosquito bug. Neem oil 3% and fish oil rosin soap were highly ineffective. The efficacy of bio-rationals were much pronounced at 14 Day After Spraying (DAS).
Presentation, 2021
The genus Helopeltis, commonly known as Tea Mosquito Bugs (TMB), is a group of Heteropterans in t... more The genus Helopeltis, commonly known as Tea Mosquito Bugs (TMB), is a group of Heteropterans in the family Miridae (capsid bugs). It is a major pest of tea, cashew and neem in Tamilnadu and is now noticed as an emerging pest in guava with life cycle of about 30-35 days. The nymphs and adults insert their proboscis into the young leaves, buds, tender shoots, inflorescence and fruits to suck the plant sap. The leaves show some sign of black spots, shrivel and eventually fall off. In Fruits corky growth and pustules on its surface is formed, which on severe infection will develop cracks on its surface followed by drying and eventually fall off. For the management of TMB, farmers mainly depend on insecticides and so, some suggestive Integrated Pest Management Modules were tested against TMB. Two field experiments were conducted in Madurai and Dindigul districts, Tamil Nadu, India. Farmers practice (F) with two Integrated Pest Management (IPM) suggestive modules (M1 and M2) were compared against untreated check, to check their efficacy for the management of guava tea mosquito bug and also their Incremental Cost Benefit Ratio (ICBR) were worked out to get the economically suitable and suggestive IPM module. The result showed that the farmers practice was found very effective with low tea mosquito bug population and high yield, followed by suggestive module – I and suggestive module – II. Even though the pest control was high in farmers practice, ICBR was high in suggestive module – II followed by suggestive module – I and farmers practice. The suggestive module – II is organic module with high ICBR, hence it can be recommended to farmers for better control of TMB, good income and residue less fruits. At needed condition any one of the effective chemicals can be sprayed.
Poster, 2021
Different botanicals and bio-pesticides were tested for their efficacy against tea mosquito bug, ... more Different botanicals and bio-pesticides were tested for their efficacy against tea mosquito bug, Helopeltis antonii Signoret in guava orchards at two locations. And the same were compared with standard check, profenophos 50 EC @ 250 ml/ ha and untreated check. It is evident that, among different treatments the standard check (profenophos 50 EC @ 250 ml/ ha) had high per cent reduction over control (71.60%). Next to that, Lecanicillium lecanii 106 CFU/ lit @ 5g/ lit is effective with 64.51% percent reduction over control. It was followed by Metarhizium anisopliae 108 CFU @ 8g/ lit, azadirachtin 10,000 ppm @ 2 ml/lit, NSKE 5% and pungam oil 3% with per cent reduction over control of 57.71%, 52.78%, 39.20% and 35.80% respectively. Neem oil 3% and fish oil rosin soap were ineffective against tea mosquito bug with low per cent reduction over control of 27.16% and 17.59% respectively.
Poster , 2022
Spodoptera litura (Fab.) an polyphagous pest gained its importance by affecting different agricul... more Spodoptera litura (Fab.) an polyphagous pest gained its importance by affecting different agricultural and horticultural crops, causing severe damage and economic losses. It has wide range of hosts including pulses, oil seeds, fiber crops, vegetable crops, fruit crops etc. Likewise this pest feeding on cassava was noticed in Vazhavachanur, Thiruvannamalai district, Tamilnadu and hence a study on biology of S. litura with cassava as its host was carried out in Agricultural college and Research Institute, Vazhavachanur. Observation on egg, larval, pre pupal and pupal period along with adult longevity was done, by which total life cycle was calculated. S. litura has four stages in its life cycle viz., egg, larvae, pupa and adult stage, hence it undergo complete metamorphosis. The mean egg period was found to be 2.0 ± 0.71 days, with 20.6 ± 2.07 days mean larval period (six instars), 2.4 ± 0.55 days mean pre pupal period, 10.2 ± 1.10 days of pupal period and 4.8 ± 0.84 days of mean adult longevity. Hence the total life cycle was found to be 40 ± 2.83 days. Comparatively the larval and pupal period of S. litura feeding on cassava was high, but the adult longevity and fecundity rate was very low and so cassava was not found to be potential main host for S. litura.
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Papers by ARAVINTHRAJU K
Conference Presentations by ARAVINTHRAJU K