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Home > Integrated Control of Yellow Rice Stem Borer Scirpophaga Incertulas Walker Lepidoptera: Pyralidae

Integrated Control of Yellow Rice Stem Borer Scirpophaga Incertulas Walker Lepidoptera: Pyralidae

Thesis Info

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Author

Dhuyo, Abdul Rehman

Program

PhD

Institute

University of Sindh

City

Jamshoro

Province

Sindh

Country

Pakistan

Thesis Completing Year

2009

Thesis Completion Status

Completed

Subject

Zoology

Language

English

Link

http://prr.hec.gov.pk/jspui/handle/123456789/1937

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676726475749

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Rice is grown on over 145 million hectares in more than 110 countries in the world. It is staple diet of over half of the world’s population and occupies almost one-fifth of the total world crop land under cereals. Rice crop is also staple food of 2.7 billion peoples in developing countries. Almost 90% of the rice is grown and consumed in Asia. Rice plays an important role in the economy of Pakistan. It is major foreign exchange earner and about 18% of the total foreign exchange is shared by rice. It comes next to wheat as the staple diet and second cash crop next to cotton in Pakistan. Rice is exported around 3.1 million tones earning 1125.82 million US Dollars. The rice crop is subjected to attack by more than hundred species of insect pests in the world. More than seventy species of insect pests have been reported to attack rice crop in Pakistan, of which twenty four species of pests have been commonly observed in Sindh. Among the pests, stem borers are major insect pest of rice crop and responsible for economic crop losses. Twenty one species of stem borers are known to attack rice in the world, of which nine different species have been reported in Pakistan. Among the stem borers, the yellow rice stem borer Scirpophaga incertulas (Walker) is one of the most important to cause colossal losses to rice crop. Globally, S. incertulas alone causes yield losses of 10 million tones. In VIPakistan, more than 90 percent damage was recorded by S. incertulas on rice crop in Pakistan. It is a monophagous insect pest. It attacks rice crop from the seedling stage to harvesting stage and thus can cause complete loss to affected tillers. In Pakistan, insecticides are the main tool to control stem borers. Use of insecticides cause environmental hazards besides various others. Keeping in view the pesticide induced problems; present study was designed to integrate various tactics to control rice stem borers. The efficiency of Neem, Clap-trips and Colocynth Tobacco extracts and chemical insecticide Karate 2.5 EC was investigated against yellow rice stem borer, S. incertulas to restrict pest population. Plant extracts significantly suppressed the population of S. incertulas. The average white heads percentage was noted from 30.63 to 44.77 and 3.72 to 4.00 per cent less in the year 2006 and 2007, respectively in the treated plots than the untreated plot (control). All the treatment including chemical insecticide Karate (standard check) gave the lowest dead hearts and white heads percentage and more numbers of productive tillers and filled grain panicles than the untreated plot (control). The plant extracts have equally controlled S. incertulas as with chemical insecticides. Extracts of Neem, Clap-trips and Colocynth extract produced higher yield than the Tobacco extract and Karate. Maximum number of the different predators were found in neem extract treated plots. On the VIIbasis of tiller infestation, high yield and the number of the predators, neem extract can be recommended as alternative insecticide against insect pest of rice crop. Genetic variability of rice varieties to stem borer attack was significantly observed. Scented rice entries: Lateefy, DR-65, Basmati 385, Basmati 370, Shaheen Basmati, DR-66, DR-61, DR-67, IR67017-13-3-3, PARC-228, Ambreen were noted more susceptible than the coarse rice entries for yellow rice stem borer. The aromatic rice entry Lateefy was recorded moderately resistance to S. incertulas under field and green house conditions than the other aromatic entries. The medium maturing coarse rice entries: Tox 3241-21-3, LTPR-4-32-1-1-1, ITR-344, LT9852-5- 2-1-1, CT22048-3, KAJAT-2, IR86949-1, TCX3162-11-1-2-1, IR65077-33-1-3-3, IR68068-99-1-33, DR-58, IR-6 were comparatively more damaged by yellow rice stem borer as compared to the early maturing rice entries: DR-83XDR-92, DR- 83XDR-46, DR-82XS.Kangani, ZHONG-XIANGI, IR72885-1-4-1-4-3-6, JIANG- ZHOU-XIANGNUD, DR-64 and DR-83. Date of rice transplanting also significantly influenced the stem borer attack. The lowest infestation by S. incertulas was recorded to the 10 th July transplanted crop producing highest yield per hectares. The late transplanting of rice crop in (August) helped in increasing population of S. incertulas, consequently reducing the paddy yield. VIIIHarvesting of paddy at certain levels from soil surface also influence the population of hibernating stem borer larvae. As stubbles height increased larval population of S. incertulas increased. Maximum population of the pest was recorded on stubble height 15 cm. Harvesting of the rice crop should be done 15-20 cm above soil surface. Close harvesting and immediate shifting of harvested paddy will decrease larval population of S. incertulas in stubbles. The rice field should not be left fallow or cultivated without ploughing. Mould Board (MB) plough should be used in rice field for severe larval mortality of S. inertulas. The damage by S. incertulas was observed after fifth week of transplanting. So before fifth week of transplanting application of control measures are not beneficial. Two isolates (274 and 373) with concentration ranging from 10 5 to 10 9 spores/ml of the fungus Beauveria bassiana were tested on eggs, larvae and pupae of S. incertulas. The maximum mortality was noted at higher concentrations (spores/ml). The higher concentrations also reduced egg hatching. The isolate No.274 was more pathogenic than the isolate No.373 to control S. incertulas. B. bassiana has a great potential to control the pest. No effect of B. bassiana was recorded on the predators. IXEating response of the predators (Coccinelid beetle, Carabid beetle, Meadow Grass hopper and Damsel fly) increased as density of eggs and larvae of S. incertulas increased. Among the predators, maximum number of the immature stages of S. incertulas were eaten by Coccinelid beetle. Therefore, we can say that Coccinelid beetle Synhamovia octamaculata is a voracious predator of immature stages. The damsel fly ate significantly less number of eggs and larvae of S. inncertulas than did the other predators. If the damage caused by S. incertulas reaches economic threshold level (ETL), besides other control measures introduction, of the predators will be beneficial for the reduction of pest population. The predators are part of biological control: non hazardous way to keep pest populations under ch
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وہ ۱۹۱۱؁ء میں پیدا ہوئے، ان کا آبائی وطن بہار کے ضلع گیا کا ایک گاؤں مخدوم پور ہے جو حضرت مولانا سید سلیمان ندویؒ کے وطن دیسنہ سے صرف سولہ سترہ میل کے فاصلہ پر واقع ہے۔
۱۹۲۲؁ء میں جب وہ گیارہ برس کے تھے تو اپنے والد مولانا اوسط حسین صاحب کے سایہ شفقت سے محروم ہوگئے، اسی سال ان کو مؤ کے مدرسہ عالیہ میں مولانا عبدالرحمن صاحب کے سپرد کردیا گیا جو میاں سید نذیر حسین محدث دہلویؒ کے شاگرد اور ان کے والد کے ہم سبق تھے، مدرسہ عالیہ میں تعلیم مکمل کرنے کے بعد وہ ۲۶؁ء میں دارلعلوم ندوۃ العلماء لکھنؤ میں داخل ہوئے اور ۲۹؁ء میں سند تکمیل حاصل کی۔
بچپن سے نیک اور سعید تھے، مؤ میں جب وہ تعلیم حاصل کررہے تھے تو ان کی عمر ۱۲۔ ۱۳ سال کی تھی، اسی زمانہ میں وہاں تحریک ترک موالات کا ایک جلسہ ہوا اس میں جب ہزاروں کے مجمع میں انھوں نے تقریر کی تو تمام لوگوں نے اسے حیرت و مسرت سے سنا حضرت سید صاحبؒ اس جلسہ کے صدر تھے، انھوں نے بھی حوصلہ افزائی فرماتے ہوئے سر پر ہاتھ رکھ کر دعادی، مولانا ہاشمی عمر بھر اس دست شفقت کی گرمی کو محسوس کرتے اور حضرت سید صاحبؒ کی عنایات و ہدایات سے مستفید ہوتے رہے، ندوہ میں سید صاحبؒ نے ان کے درجہ میں تاریخ اسلام پر کئی لکچر دیے، سید صاحبؒ وفد خلافت کے رکن کی حیثیت سے حجاز گئے، واپس تشریف لائے تو ندوہ کے اساتذہ و طلبہ کی طرف سے ایک استقبالیہ جلسہ ہوا، اس میں مولانا...

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Chromatographic Resolution of Closely Related Species in Pharmaceutical Chemistry: Drug Analogs and Isomers

A traditional approach to method development could flop to encounter desired separation downstream during test method validation, test method transfer or out of specification studies. In contrast, method development through quality by design (QbD) approach can result in a more rugged/robust method due to greater emphasis on risk management. A design of experiments (DOE) approach which involves both statistical analysis and modeling is used in a QbD approach to understand the impact and interactions between critical method variables. A QbD approach is applied in present study to drug analogs and isomers complex method development using Shimadzu LC Solution Software. The permissible nonconformities of method variables are determined within the design space – the proven acceptable ranges (PARs). The critical method variables in attaining chromatographic resolution for drug analogs and isomers were column chemistry, chromatography type, sample preparation and mobile phase. The prospective intrusion of method variables was determined in terms of desirable method responses, leading to a better method understanding besides achieving anticipated method quality. Effect of column physical properties (length and inner diameter) on separation and speed was investigated during initial screening experiments. Effect of chemical properties (type of surface, pore size and particle size of stationary phase) on sensitivity and retention factor were studied. Both pH and ionic strengths of the aqueous portion of mobile phase were considered in developing rugged methods that were not sensitive to small variations in conditions. Unified quantification methods for structural, functional and direct analogs of sartans (angiotensin II receptor antagonists), statins (3-hydroxy-3-methylglutaryl coenzyme A reductase inhibitors), quinolones, proton pump inhibitors (PPI’s) with gastroprokinetic agents and dipeptidyl peptidase-4 (DPP-4) inhibitors with biguanide are developed. Additionally enantiomers of linagliptin, sitagliptin phosphate, cetirizine hydrochloride, solifenacin succinate and montelukast sodium are separated on Diacel Chiralpak IC stationary phase instead of using separate stationary phase for individual enantiomeric separation. The proposed methods were statistically validated in terms of precision, accuracy, linearity, specificity, selectivity and robustness in accordance with guidelines of International Council on Harmonisation (ICH). The newly developed methods proved to be specific, accurate and robust for the unified quantification of drug analogs in commercial pharmaceutical formulations and to confirm the relative abundance of desired enantiomer in a racemic mixture of active pharmaceutical ingredient. The advantage of developed methods for unified quantification of drug analogs is that only one sample is prepared and single chromatographic run is required to provide information on the identity, content uniformity, dissolution, potency and purity of active pharmaceutical ingredients. Therefore, these methods can be handy in daily sample handling in routine, when many samples of drug analogs are analyzed in drug testing laboratories. The proposed methods are able to discriminate not only between different drug analogs and enantiomers but are also able to detect counterfeit products.