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Toxicity of Microbial Insecticides and Chlorantraniliprole for the Control of Helicoverpa Armigera Hubner on Chickpea

Thesis Info

Access Option

External Link

Author

Tahir, Muhammad

Program

PhD

Institute

University of Agriculture

City

Faisalabad

Province

Punjab

Country

Pakistan

Thesis Completing Year

2017

Thesis Completion Status

Completed

Subject

Entomology

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/13462/1/Muhammad_Tahir_Entomology_HSR_2017_UAF_4.12.2017.doc

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727622351

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The Helicoverpa armigera is a voracious and economically important insect pest devastating chickpea crop all over the world. To combat these pests the mainstay of the farmers are the use of conventional chemical insecticides, against these insecticides resistant has developed. The current study aimed at evaluation of microbial entomopathogens and new chemistry insecticide coragen against H. armigera. The study consisted of a series of experiments to screen different fungal isolates of Beauveria bassiana s.land Metarhizium anisopliae s.l. to pick potential isolates against larvae of H. armigera, to evaluate the capacity of B. bassiana to colonize endophyticallyand their integrated use with Bacillus thuringiensis against H. armigera, to check the effectiveness of entomopathogenic nematode Heterorhabditis bacteriophora Poinar, B. bassiana and M. anisopliae alone and integrated manners, while sequential applications of H. bacteriophora were made after fungal treatment. Finally these agents were deployed under field conditions to determine their effect on survival of natural allies, pod infestation and the effect of treatments on the yield of chickpea. Four isolates of B. bassiana (WG-11, WG-12, WG-16 and WG-18) and one isolate of M. anisopliae (WG-44) exhibited greater virulence against both 2nd and 4th instar larvae among 22 tested isolates. These isolates revealed lowest LC50 and LT50 values. Beauveria bassiana colonize endophytically in chickpea plant very successfully and synergistic interaction (CTF≥20) was recorded at the moderate dose of B. thuringiensis and endophytic B. bassiana when fed with fungal inoculated chickpea leaves. Moreover, both agents have detrimental effects on pupation, adult emergence, egg eclosion and the developmental parameters of H. armigera. The toxic nature of microbial agents also influenced the diet consumption, frass production and weight gain. In combined treatments of entomopathogenic fungi and H. bacteriophora additive to synergistic interactions were recorded. The degree of addictiveness and synergism increased with delayed application of H. bacteriophora. These treatments also significantly affected pupation, adult emergence, egg eclosion and developmental parameters of H. armigera. The toxic nature of microbial agents also influenced the diet consumption, frass production and weight gain. Integrated application of B. bassiana, B. thuringiensis and coragen were made on chickpea under field conditions. Maximum marginal return was obtained in integrated application of B. thuringiensis + coragen treatments compared to their sole application. Microbial agents in simultaneous application are proved to be effective in lowering the larval density of H. armigera and hence lowering the yield losses. Microbial agents are relatively safe to natural enemies of H. armigera and hence proved to be eco-safe agents. Maximum marginal return was obtained in combined application of microbial agents than their individual application. Moreover, newer chemistry insecticides exhibit unique mode of action and better environmental profile that could help to rotate or replace the older insecticides.
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خِلقتِ کُن کی بِنا اِس نُور پر رکھی گئی

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پھر نہ آئی لوٹ کر ؛ ایسی مٹی ، ایسی گئی

آپؐ کے در پر سخاوت کو عُروج اِتنا ملا
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خلوتِ غم میں جسے غمخوار کی یاد آ گئی
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تاجدارِ انبیاؐ کی اِقتدا کرتی گئی

SINERGITAS PENGEMBANGAN KURIKULUM PAI DALAM PENDIDIKAN

Islamic education curriculum has central value for education process, as education vision direction. Islamic education mission is how to create religious people by leaning perfectly. Curriculum becomes one of success applications and quality in education institution most. Curriculum will develop based on global world and people life style existency. Therefore, education should view people life style increased as learning source that is becomed a value for curriculum step making. Beside that, islamic education curriculum development also becomes teacher’s choice to implement learning manner in class. In where, it’s implementation should be arranged and systematically to make maximal learning either in development vision, indicator, lesson teory, lesson model proccess, learning evaluation or teacher’s development skill. The process of islamic education curriculum development  must be done good and awesome also seeing several factors as supports and obstacles of it. In other to get an education result based on such the plan made before(education planning).

Premature Bolting in Onion Bulb Crop Effect of Transplanting Dates, Seedling Age Nitrogen Fertilizer and Cultivars

Research trials were conducted at Agricultural Research Institute, Mingora Swat over two consecutive growing seasons from November to June 2013-14 and 2014-15. In the first trial seedlings of 45, 60 and 75 days old were transplanted on 5 different dates (30th November, 15th December, 30th December, 15th January and 30th January) to study its effect on premature bolting in onion. Transplanting dates and seedling age exerted significant effect on different growth and yield parameters studied. Plant height, number of leaves at bolting, stem thickness, days to maturity, bulb diameter, bulb weight and total yield (ton ha-1) decreased with delay in transplanting as well as with increasing seedling age. On the other hand, bolting and cull percentage decreased with delay in transplanting and increased with increase in seedling age. Maximum marketable yield (ton ha-1) was recorded when 60 days old seedlings were transplanted on 15th December. The correlation co-efficient analysis data revealed a positive correlation between marketable yield (0.671 ton/ha) and bulb diameter (0.381). Non- significant positive correlations of marketable yield were recorded with bulb weight (0.173), number of leaves at bolting (0.097), stem thickness (0.091) and plant height (0.106). The association of marketable yield with bolting percentage (-0.381) and % cull (-0.552) was significantly negative. In the second trial three commercial cultivars ‘Swat-1’, ‘Saryab Red’ and ‘Chiltan-89’ were transplanted on five different dates at 15 days interval (25th November, 10th December, 25th December, 10th January and 25th January). Cultivars varied in their susceptibility to bolting. Cultivar Swat-1 took significantly maximum (78.67 days) to bolting initiation and recorded minimum bolting percentage (12.51%) compared to ‘Saryab Red’(13.75%) and ‘Chiltan-89’ (17.32%). Early transplanting took less (108.06 days) to bolting initiation. Bolting percentage was maximum (34.52%) at early transplanting and reduced with delay in transplanting from 25th November to 25th December. Bolting was not recorded at late, (10th and 25th January) transplanting irrespective of the cultivar. When compared to ‘Saryab Red’ and ‘Chiltan-89’, ‘Swat-1’ had maximum plant height (65.58 cm), number of leaves per plant (10.64), stem thickness (15.43mm), bulb diameter (60.08 cm), bulb weight (169.08 g), and days to maturity (168.37), total (32.94 vii ton ha-1 ) and marketable yield (25.07 ton ha-1 ). Plant height (61.24cm), number of leaves per plant (10.96), stem thickness (17.24 cm), bulb diameter (63.08 cm), bulb weight (149.31g), and days to maturity (167.89), total yield (31.07 ton ha-1) was maximum at early transplanting and decreased with delay in transplanting. Cultivar Swat-1 produced maximum marketable yield (25.07 ton ha-1) than ‘Saryab Red’ and ‘Chiltan-89’. Marketable yield was maximum at mid transplanting date (25th December); attributed to less bolting and percent cull compared to early transplanting. Unmarketable yield at early transplanting was largely due to bolting while at late transplanting it was due to small ungraded bulbs. In the third trial different rates of nitrogen fertilizer (75, 100, 125 and 150 kg ha-1) were applied at different transplanting dates (15th Nov, 1st Dec, 15th Dec, 1st Jan and 15th Jan) with the objective to determine its influence on inflorescence development in onion bulb crop. Bolting percentage decreased gradually with increase in the rate of nitrogen fertilizer. Maximum bolting percentage was recorded in early transplanting and declined with delay in transplanting. Bolting incidence did not occurre in very late (15th January) transplanting irrespective of the rate of nitrogen applied. Plant height, stem thickness, bulb diameter, bulb weight and total yield ton ha-1 increased with increase in nitrogen fertilizer and conversely showed a downward trend with delay in transplanting. Different rates of nitrogen fertilizer didn’t significantly influence number of leaves plant-1. However, early transplanting exhibited significantly more leaves than late transplanting. Early transplanting took maximum 175.88 days to maturity than late transplanting (163.75) days. Maturity was delayed with increase in nitrogen fertilizer. Percent cull decreased with increase in the rate of nitrogen fertilizer. Marketable yield ton ha-1 was maximum at mid transplanting date (15th December) and with maximum rate of nitrogen fertilizer. The correlation co-efficient analysis revealed that marketable yield ton ha-1 has positive correlation with plant height, number of leaves plant-1, bulb diameter, bulb weight, total yield ton ha-1 and negative correlation with stem thickness bolting percentage and percent cull. Bolting percentage has positive association with percent cull. It can be concluded that bolting resistant cultivar is not available in this country, however, ‘Swat-1’ performed best in the existing cultivars. Research should be initiated to develop bolting resistant cultivars or produce resistance in available cultivars through phenotypic recurrent selection. Modification in cultural practices remained the viable option for the growers to mitigate bolting problem. Transplanting should be delayed in such a way to avoid plants receiving cold temperature at sensitive stage to minimize bolting. Correct transplant age (50-60 days) and ample nitrogen fertilizer of 125-150 Kg ha-1 also reduced the incidence of bolting