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Bioecology of important foliage insect - pests and characterization of teak

KrishiKosh

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Title Bioecology of important foliage insect - pests and characterization of teak
 
Creator Kabade, K.H.
 
Contributor Patel, Z.P.
 
Subject application methods, bacteria, millets, planting, granules, biological development, wheats, nutrients, processed plant products, biological phenomena
 
Description The present investigations on “ Bioecology of important foliage insect - pests and characterization of teak ” was carried out under field condition at upper and lower elevations in Dangs as well as at plane elevat i on at Navsari in south Gujarat. L aboratory studies on biology and evaluation of ntomogenous fungus was carried out at Food Quality Testing Laboratory and biochemical
aspects were studied in the Biotechnology and Agricultural Chemistry laboratory of ASPEE College of Horticulture and Forestry, Navsari Agricultural University, Navsari during 2010 -2011. T eak defoliator oriented leaf infestation initiated at upper elevation from June indicating its peak (48.53 %) during July II nd fortnight which later declined to the minimum (2.13 %) during II nd fortnight of ovember . Similarly at lower elevation, incidence commenced from June attain ing its peak (65.97%) during July II nd fortnight . On the other hand, lowest damage (5.31 %) was observed during II
nd fortnight of November. Lastly in plane elevation , incidence commenced from June indicating its peak (41.27 %) and lowest (3.89 %) damage during I nfortnights of July and November, respectively . Correlation between leaf defoliator dam age and rainfall was significant. Likewise, teak skeletonizer
inflicted leaf damage initiated from April at upper elevatio reaching to its peak (49.20%) during I
sfortnight of July and lowest damage (6.11 %) during I n fortnight of December. A t lower elevation , leaf infestation initiated during April and reached to its peak (83.76%) during st fortnight of July and later it decreased to its lowest (5.88 %) during I n f ortnight of December . A t plane elevation of Navsari , leaf infestation started from April which reached to its peak (86.87%) during st
fortnight of Jul while, the lowest level (11.78 %) was observed during I n fortnight of December . C orrelation between leaf skeletonizer oriented leaf damage and rainfall was significant and positive .
Teak defoliator female laid eggs singly on the ventral side of leafmeasur ing 0.96 and 0.47 mm in length and breadth , respectively . I ncubation period and hatchability were 2.52 days and 55.18 per cent , respectively . The first, second, third, fourth and fifth instar larvae measured 2.54, 2.46, 2.49, 2.49 and 3.86 days, respectively . T otal larval period was 13.83 days. T he pre - pupa l and pupal period s of male and female insect s lasted for 2.29, 4.39 and 7 days, respectively . The pre - oviposition, oviposition and post oviposition period s were of 2.22, 3 and 3.28 days, respectively . The fecundity of the female insect was 11.29 eggs. The longevity of female and male insects was 7.50 and 6.05 days , respectively . Total life cycle of male and female insects was completed in 25.95 and 26.55 days . Similarly, teak skeletonizer female laid eggs singly on the ventral side of the leaf n ear the leaf lamin measuring 0.27 mm each in length and breadth . The incubation period and hatchability were 2.60 days and 60.56 per cent , respectively .The duration of first, second, third, fourth and fifth instar larvae were 2.29, 2.45, 2.17, 3.16 and 3.41 days, respectively. T otal larval period was 13.16 days . The pre - pupal and pupal period of male and female insects were 2.30, 3.92 and 5.64 days, respectively . The pre - oviposition, oviposition and post oviposition period s were 1.48, 4.22 and 1.52 days , respectively. F ecundity of the female insect was 82.17 eggs. The longevity of male and female insects was 3.13 and 6.22 days respectively . Total life cycle of male and female insects was completed in 25.81 and 28.24 days , respectively . A spergillus flavus an entomogenous fungus was found pathogenic to early second instar larva of E. machaeralis at 2.25 × 17 spores/ml causing 100 per cent mortality. Similarly, 95 per cent mortality of late (fifth) instar
larva was observed on th day at 2.25 × 107 spores/ml. C orrelation between leaf damage of defoliator and skeletonizer and morphological character s (leaf length, width, area band colour) was non - ignificant w hereas, these damages indicated significant and positive association with chlorophyll a, b , and negative with phenol and protein. The teak defolia tor leaf damage was highes during July, coinciding with emergence of new leaves and maturity of leaves while , it remained low during October – November when tree species passed through foliage matur ity. The teak skeletonizer oriented leaf damage was highest during July coinciding w ith emergence as well as maturity of leaves followed by lowest damage during December. On the basis of data of different elevation d uring present studies the Crop - Pest Map and Pest Calander for teak defoliator and skeletonizer were also prepared.
 
Date 2016-05-17T11:46:11Z
2016-05-17T11:46:11Z
2014
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66016
 
Language en
 
Format application/pdf
 
Publisher NAU