A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Bhagawati, Sudhansu
- Bioecology And Management of Giant African Snail, Achatina Fulica (Bowdich)
Authors
1 Department of Entomology, Assam Agricultural University, Jorhat (assam), IN
2 Department of Soil Science, Assam Agricultural University, Jorhat (assam), IN
Source
International Journal of Plant Protection, Vol 7, No 2 (2014), Pagination: 476-481Abstract
Giant African snail (Achatina fulica Bowdich) belongs to the Phylum-Mollusca and Class- Gastropoda. It is known for its destructive nature on cultivated crops wherever it occurs and is one of the world's largest and most damaging land snail pests. The pest is an East African origin, has spread in recent times by travel and trade to many countries. They now widely distributed and no longer limited to their region of origin due to several factors viz., high reproductive capacity, voracious feeding habit, inadequate quarantine management and human aided dispersal. A. fulica can cause serious economic damage on different crops and extensive rasping (scrapping), defoliation, slime trials, or ribbon like excrement is signs of infestation. In recent times, severe outbreak of this pest has been noticed due to some desirable agricultural and gardening practices like minimum tillage practices and straw retention techniques which help in survival of snails and make seedlings more susceptible to damage. This review paper aims to enlighten on taxonomy, distribution, extent of damage, morphology, biology, ecology, homing behaviour, seasonal incidence, nature of damage, host plants of A. fulica and its ecofriendly management strategies.Keywords
Bioecology, Management, Giant African Snail, Achatina fulica- Methods of Extraction of Mucin From Giant African Snail Achatina fulica Bowdich
Authors
1 Department of Entomology, Assam Agricultural University, Jorhat 785013, Assam, IN
2 Department of Soil Science, Assam Agricultural University, Jorhat 785013, Assam, IN
3 Department of Biochemistry and Agricultural Chemistry, Assam Agricultural University, Jorhat 785013, Assam, IN
Source
Indian Journal of Entomology, Vol 84, No 2 (2022), Pagination: 296-300Abstract
Achatina fulica Bowdich is one of the most notorious pests in crop fields. However, the mucin secreted by this terrestrial mollusc has magnificent pharmaceutical attributes. In the present study, solvent and mechanical methods were explored to find out the best method of mucin extraction from this gastropod pest under laboratory conditions. In case of both medium and large sized snails, dichloromethane registered the maximum (2.79 ml and 2.94 ml, respectively) mucin collection out of the six solvents tested. Volume wise comparison showed that the maximum amount of mucin recovery was possible in the highest volume (3 ml) of solvents applied for both the age groups. Of all the mechanical methods tested, smoking method yielded maximum (2.05 ml and 3.02 ml) amount of mucin from both medium and large sized snails, respectively. However, the minimum mucin recovery was registered when the snails were allowed to move over rough tiles.Keywords
Achatina fulica, mucin, terrestrial mollusc, pharmaceutical, solvent, mechanical methods, gastropod pest, dichloromethane, smoking method, rough tiles, acharan sulfate.References
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- Evaluation of Some IPM Modules Against Red Ant Dorylus Orientalis Westwood in Potato
Authors
1 Department of Entomology, Assam Agricultural University, Jorhat 785013, Assam, IN
Source
Indian Journal of Entomology, Vol 84, No 1 (2022), Pagination: 140-144Abstract
Field experiments were conducted at Charaibahi village, Jorhat, Assam during 2015-17 to evaluate six ecofriendly IPM modules against red ants Dorylus orientalis Westwood in potato. Among the modules evaluated, Module-II (pre sowing treatment of mustard oil cake @ 150 kg/ ha+ wood ash 150 kg/ ha+ panchagavya @ 3% and soil drenching with neem oil @ 5 ml/ lit after 1st and 2nd earthing up (25 and 60 DAS) recorded the lowest tuber damage both in weight (8.65%) and number (10.70%) basis and found at par with the recommended package of practices (RPP) (application of malathion 5% dust @ 40 kg/ ha+ mustard oil cake @ 150 kg/ ha in the soil after 1st and 2nd earthing up) recording 8.18 and 10.20% tuber damage, respectively. The same module also recorded highest tuber yield (119.37 q/ ha) which was at par with the RPP (120.12 q/ ha). The maximum benefit cost ratio (1.41) was recorded in RPP followed by Module-II (1.33) and Module-VI (1.26). The untreated control plot registered a very high level of tuber damage (25.93 and 28.70 on weight and number basis, respectively) having maximum population of red ants (3.95 numbers/ m2 ) with a tuber yield of 89.91 q/ ha.
Keywords
Dorylus orientalis, IPM modules, incidence, tuber damage, panchagavya, neem oil, mustard oil cake, wood ash, malathion, soil drenching, earthing up, yield, cost benefitReferences
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- Population Dynamics of Red Ant Dorylus Orientalis in Potato Grown Under Flood Free/ Prone Conditions
Authors
1 Department of Entomology, Assam Agricultural University, Jorhat 785013, Assam, IN
Source
Indian Journal of Entomology, Vol 84, No 4 (2022), Pagination: 942-946Abstract
Experiments were carried out in the farmer’s field at Jorhat during 2015-16 and 2016-17 to study the population dynamics of red ant Dorylus orientalis Westwood in potato crop. The incidence of D. orientalis was observed both under flood free/ and prone conditions in three villages each, during potato growing season. These data were correlated with weather factors. The effect on population buildup was studied with observations at fortnightly interval starting from 1st fortnight of October to 2nd fortnight of February through fixed plot surveys. The observations revealed that maximum incidence (36.5, 33.2 and 30.1; 35.2, 32.5 and 29.8/ pit) was observed in Charaibahi, Karangia and Hokai Khangia villages, respectively during the 1st fortnight of January. In contrast, in the flood prone villages, incidence was observed to be negligible. Correlation coefficients of incidence with weather factors revealed that minimum temperature, soil temperature (morning and evening) and evaporation rate show a significantly negative correlation; whereas relative humidity (RH) (morning and evening) exhibited significant positive correlation in flood free villages. In flood prone villages minimum temperature as well as morning soil temperature showed significant negative correlation (2015-16); in contrast, in flood prone villages, RH (morning and evening) showed significant positive correlation (2016-17).Keywords
Dorylus orientalis, population dynamics, fixed plot survey, flood free/ prone, potato, temperature, relative humidity, soil temperature, evaporation rateReferences
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