Author:
Publisher:
ISBN:
Category : Pests
Languages : en
Pages : 132

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Author:
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 20

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Author: Rola Michel Atiyeh
Publisher:
ISBN:
Category : Nitrogen fertilizers
Languages : en
Pages : 142

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An experiment was conducted in 1992 at the Agricultural Research and Education Center {AREC) of the American University of Beirut, Lebanon, to determine the effect of three planting dates (May 7, 21, and June 4) and three nitrogen levels (0, 100, and 200 Kg/ha) on population growth of corn leaf aphid, Rhopalosiphum maidis (Fitch), percent corn borer, Sesamia cretica Led., and corn earworm, Heiicoverpa armigera (Hubn.t, infestation, and yield components of sweet corn.Aphid populations were recorded at 12-leaf, tassel, silk, blister, and milk stage. Aphids were counted on one leaf chosen from lower, middle and upper 1/3 of the plant. Results revealed that the aphid population was not affected by planting date, but was significantly higher at silk stage, when nitrogen was not applied (8.18 aphid/leaf), with higher number of aphids (8.29/leaf) occupying the upper leaves (upper 1/3) of the plant. Stalk infestation by corn borer was very low (0.96%). Early planting of sweet corn resulted in higher percent (8.87) of ear infestation (by corn borer and corn earworm) which decreased with each delay in planting from May 7 to June 4. Emergence, plant height, total number of tillers, number of fertile tillers, number of ears per tiller, percent seed moisture, total ear weight, and biological yield of sweet corn were not significantly affected by the treatments. Early planting of sweet corn resulted in the highest, averaged over nitrogen levels, total ear weight (12940.3 Kg/ha), number (23500/ha) and weight (6634.3 Kg/ha) of marketable ears , percent marketable ears (32%), and harvest index (0.19), but decreased as planting was delayed. Increase in nitrogen level f rom 0 to 100 Kg/ha resulted in significant increase in number and weight of marketable ears. As nitrogen level was increased from 100 to 200 Kg/ha, number and weight of marketable ears decreased. Total number and weight of non-marketable ears ( diseased, immature, infested, or not fitting the standards of marketability) were not significantly affected by the treatments. However, number of diseased ears increased while number and weight of infested ears decreased as planting was delayed.

Author: Richard Llewellyn
Publisher:
ISBN: 9781864239720
Category : Heliothis
Languages : en
Pages : 70

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Author:
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 36

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Author: Omkar
Publisher: Springer
ISBN: 9811086877
Category : Science
Languages : en
Pages : 1075

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This book comprehensively compiles information on some of the major pests that afflict agricultural, horticultural and medicinal crops in particular as well as many polyphagous pests. Not only does this book deal with the pests of common globally produced crops it also addresses those of rarely dealt with crops such as seed spices, medicinal and aromatic plants. While the perspective of insect pests is largely Indian and South East Asian in context, the book does deal with globally problematic pests, particularly polyphagous ones. Not only will the readers be acquainted with the pests, their damaging potential and their life cycle but also with the latest methods of managements including ecofriendly measures being employed to keep pest populations at manageable levels. The 27 chapters in the book, are grouped into four sections primarily based on crop types, viz. pest of agricultural, horticultural and medicinal crops, and polyphagous pests, making the book easy to navigate. Each of the chapters is comprehensive and well illustrated and written by academicians who have dedicated their entire lives to the study of a particular crop-pest complex. The final chapter of this book provides an overview on the principles and processes of pest management.

Author: Lee R. Van Wychen
Publisher:
ISBN:
Category :
Languages : en
Pages : 316

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Author: J. L. Libby
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 12

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Author:
Publisher:
ISBN:
Category : Corn
Languages : en
Pages : 24

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Author:
Publisher:
ISBN: 9780734105639
Category : Agricultural pests
Languages : en
Pages : 249

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