Effects of Cotton Plant Spacing on Insect Infestation, Natural Enemies and Yield, Gezira State, Sudan

الموضوعات

زراعة

الملخص

In the Sudan, Gezira Scheme, the cotton, Gossypium barbadense was grown under irrigation without insecticidal use for more than thirty years (1911-1945). That may be due to the traditional growing of cotton, in the same area under rainfed before the establishment of Gezira Scheme. Such practice witnessed a balanced agricultural ecological system in the cotton growing area. Since seasons 1945/46 till now more than 300 insecticides and insecticide mixtures were recommended. The average of yield was less than 7.0 kantar/feddan for upland cotton. The objective of this study to test the effects of sown crop of cotton with various spacings upon insect pests infestations natural enemies and quantity and quality of cotton produced. In this study early sowing during June with various spacing without insecticidal spraying were tested for the Brazilian (LL) variety . The crop was planted in June 20, 2012. The spacing tested were 10.0 cm, 20.0 cm, 30.0 cm and 40.0 cm between holes to be compared with the practiced spacing, 50.0 cm. Insect pests and natural enemies were monitored. The results showed that the sucking insects, Jassid Empoasca lybica and the whitefly, Bemisia tabaci were shown in July, increased in number to reach the peak in August and then decreased to reach the bottom in October. The variety under test was attacked by the bollworms, Helicoverpa armigera and Erias insulana. However the shedding of fruiting bodies due to bollworms was recorded. H. armigera reflected higher damage of fruiting bodies during August among wider spacing (40 and 50 cm) and the result was opposite during September. For E. insulana, damage of fruiting bodies was lower among wider spacing compared to narrow spacing during August and September. Natural shedding of fruiting bodies was low during August and high during September among wider spacing (50.0 cm). The buildup of natural enemies started in July to reach the peak in September and decreased in October, in a density dependent pattern with sucking insect pest populations. The yield of cotton lint in kantar per feddan was 5 folds more at 10.0 cm spacing and 2.5 folds more at 20.0 cm compared to the recommended spacing 50.0 cm. However, the quality, read as stickiness, was satisfactory among all spacing under test. The study revealed that narrow spacing reflected better performance of natural enemies that checked the insect pest infestations and hence higher yield with good quality of cotton. Results were discussed with previous work in the field of study.

روابط وملفات

التعريف والنوع

رقم الوثيقة

ed381dfc-d89f-4c1a-b022-85fa4805b426

رقم العقد

0

نوع الوسائط

Crawler

نوع المحتوى

الرسائل العلمية

صيغة المصدر

رسائل ماجيستير

نوع الملف

pdf text

أسماء الملفات

73564_1.pdf

بيانات النشر

ترجمة العنوان

تأثيرات مسافات زراعة القطن على الإصابة بالحشرات - والأعداء الطبيعيين والإنتاجية - ولاية الجزيرة - السودان

ألقاب المؤلفين

[{"name_ar":"أحمد البشير محمد حسن","title_ar":"اشراف","title_en":"Supervision"},{"name_ar":"سلمى عثمان صالح محمد","title_ar":"اعداد","title_en":"Preparation"},{"name_ar":"هالة الطاهر","title_ar":"اشراف","title_en":"Supervision"}]

اللغة

English

المصدر والدورية

اسم المصدر

Effects of Cotton Plant Spacing on Insect Infestation, Natural Enemies and Yield, Gezira State, Sudan

المحتوى والصفحات

عدد الصفحات

0

إشراف وإعداد

الإشراف

أحمد البشير محمد حسن, هالة الطاهر

الإعداد

سلمى عثمان صالح محمد

الاقتباسات الببليوغرافية