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Authors: Sharad, Sangode Ekta
Advisor: Jadeja, I. B.
Title: Development of Insect Pest Management Module for Eucalyptus Gall Insect Leptocybe Invasa Fisher & Lasalle (Hymenoptera : Eulophidae) in Nursery adn young Plantations
Publisher: Department of Forestry ASPEE College of Horticulture and Forestry , Navsari Agriculture University
Language: en
Type: Thesis
Pages: 109
Agrotags: null
Keywords: Forestry
Abstract: Studies on "Development of insect pest management module for Eucalyptus gall insect Leptocybe invasa Fisher & LaSalle, (Hymenoptera: Eulophidae) in nursery and young plantations" were conducted at Department of Forestry, ASPEE College of Horticulture and Forestry; Nav sa ri Agricultural University, Navsari, during November 2009 to April 2010 to develop control strategies against Blue gum chalcid. The studies were carried out on nursery seedlings and tran s planted seedlings in field as well as on fresh coppice growth of 25 year old trees. The experiments were conducted in a completely randomized design with two treatments viz; treated and untreated plots replicated twelve times. In treated plot, the soil treatment of • chlorpyriphos @ 0.05 % along with a schedule of foliar sprays consisting of imidacloprid- 0.005 % (after 7 days of soil treatment), monocrotophos-0.05 % (after 21 days of I S( foliar spray) and DDVP - 0.05 % (After 15 days of 2nd foliar spray) were applied as a component of the treatment module. In case of nursery seedlings, the initial gall intensity was 0.50 and 0.29 per inch on infested leaves in treated and untreated plots, respectively, which varied non-significantly. It transformed into gall intensity of 0.00 and 2.03 in respective plots at 150 days. In field condition, before application of chemical treatments, it was 0.27 and 0.31 in both the plots. At ISO days, it reached to the level of 0.80 and 2.95 in respective plots. In coppice seedlings, the gall intensity before application of treatments was 14.15 per inch and 14.15 in treated and • untreated plots, which reached to the level of 1.38 and 38.22 at 105 days, respectively. The initial observation based on infestation on seedling basis in nursery was 20.00 and 36.66 per cent in respective plots, which later changed to 3.33 and 100.00 at 90 days! respectively in treated and untreated plots. Whereas, in field condition it was 28.66 and 30.77 per cent respectively. The maximum incidence (78.33) was observed at 135 days and lowest (58.33) at 45 and 105 days in treated plot, whereas in untreated plot, it remained maximum (91.67) at 45 and 60 days and minimum (71.66) at 150 days. In case of coppice shoots, it was 75.0 in both the plots before imposition of treatments, which reached to 45.83 and 100.0 at 75 days in respective plots. Before spray, the leaf infestation in nursery was 13.85 and 5.74 per cent in treated and untreated plots, respectively , which was reduced to 0.0 in treated and maximized to 95.09 per cent in untreated plot at 135 days. In field transplanted young seedlings, the before spray infestation was 6.87 and 7.14 per cent in treated and untreated plots, while it progressed to 48.75 and 100.0 per cent respectively at 150 days. In coppice shoots, before spray, the upper canopy had incidence of 52.91 and 50.01 per cent in treated and untreated plots, respectively. Whereas, at 105 days it became 23.52 and 96.99 per cent in both the plots. Similarly in lower canopy, it remained 59.65 and 58.16 per cent before treatment which transformed into 32.99 and 97.22 per cent, respectively at 105 days. Before the initiation of experiment, the galls in nursery seedlings, young transplanted seedlings and coppice shoots; were located in petiole, midrib and petiole in both the plots, respectively. In post spray observations, in nursery seedlings, galls disappeared steadily in treated plants, whereas in untreated plot, petiole was heavily galled at 90 days. However, in field condition , swelling was on midrib in treated plot, whereas in untreated plot it was in petiole. In case of coppice shoots, it located in petiole in both the plots at each interval. In nursery, field and coppice shoots, the initial gall type was swelling, swelling and gall with presence of exit hole in respective plots. After imposition of treatments in treated plot, • the symptoms type was swelling with disappearance of gall, fully mature gall and gall with exit hole, respectively, while in untreated plot, it transformed into fully mature galls with symptoms of exit hole in nursery , gall with exit hole showing hanging canopy, drooping of branches and heavily galled seedlings in field and coppice shoots . The avoidable crop loss in term of benefit over control in nursery, field and coppice were 59.33, 43.94 and 95.33 per cent, respectively .
Subject: Forestry
Theme: M.Sc. Thesis
These Type: M.Sc
Issue Date: 2009-11
Appears in Collections:Master Degree Theses

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