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BIOLOGY, POPULATION DYNAMICS AND EFFECT OF BIO-PESTICIDES ON GROUNDNUT THRIPS

KrishiKosh

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Title BIOLOGY, POPULATION DYNAMICS AND EFFECT OF BIO-PESTICIDES ON GROUNDNUT THRIPS
 
Creator JadavD. V.
 
Contributor Dr. A. V. Khanpara
 
Subject ENTOMOLOGY
 
Description Investigations were carried out on “biology, population dynamics and effect of bio-pesticides on groundnut thrips” at Department of Entomology and Instructional Farm,College of Agriculture, Junagadh Agricultural University, Junagadh during kharif2014 on groundnut variety GG 20. Observation on various life stages were made at a constant temperature of 25 ± 1oc.
The eggs were laid in the leaf tissues. The average egg period was found to be 7.96 ± 1.06 days. The larva passed through two distinct instars and average duration of each instar was 3.20 ± 0.82 and 3.76 ± 0.72 days,respectively. The total larval period was on an average 6.96 ± 1.54 days.The pre-pupal and pupal period had an average of 1.44 ± 0.51 and 1.64 ± 0.49 days, respectively. The total period was an average of 3.08 ± 1.00 days.The male and female thrips lived for an average of 19.32 ± 1.35 days and 21.76 ± 2.44 days respectively.The pre-oviposition, oviposition and post-oviposition periods was varied an average of 3.16 ± 0.69, 14.24 ± 1.74 and 3.64 ± 0.81 days, respectively.Fecundity of female of C. indicuswas an average of 64.08 ± 12.97 at a constant temperature of 25 ± 1°C.Sex ratio of male and female C. indicus at a constant temperature of 25 ± 1°C was 1: 1.49.The entire life span of male was an average of 34.56 ± 3.85 days and that of female was an average of 36.56 ± 3.79 days. Thus, the life span of female was longer than male.
The experiment on population dynamics of groundnutthripswas conducted at Junagadh (SouthSaurashtra Agro-Climatic Zone).The pest infestation was initiated second week after sowing of crop and remained continue upto the crop maturity. The pest population reached at a peak during the 8th week after sowing (35th standard week) and peaked5.81thrips/plant.Thereafter, it started to decline slowly toward the maturity of the crop.
Thus, the results of the two spraying of the biopesticides against the groundnut thrips revealed that M. anisopliae 2 kg/ha, Neem oil 2 per cent and B. bassiana 2 kg/ha were found more effective treatments against the pest as compared to other treatments. They caused around 70 to 85 per cent pest mortality in the field.
However, the treatments of Custard apple leaf extract 5 per cent and Karanj oil 2 per cent were found less effective treatment against the thrips.
All the bio-pesticides gave significantly higher pod yield of groundnut as compared to control. Among the various bio-pesticides, M. anisopliae@ 2.0 kg/ha recorded the highest pod yield of groundnut i.e. 1675 kg/ha which was found statistically at par with Neem oil 2 per cent (1545 kg/ha), V. lecanii@ 2.0 kg/ha (1480 kg/ha) and B. bassiana@ 2.0 kg/ha (1475 kg/ha).
In case of haulm yield of groundnut, among the various bio-pesticides, M. anisopliae@ 2.0 kg/ha recorded the highest haulm yield of groundnut i.e. 3285 kg/ha which was found statistically at par with Neem oil 2 per cent (3110 kg/ha), and B. bassiana@ 2.0 kg/ha (3038 kg/ha).
The highest per cent increase in pod yield was recorded in the treatment of M. anisopliae@ 2.0 kg/ha (70.05 per cent), followed by Neem oil 2 per cent (56.85 per cent), V. lecanii @ 2.0 kg/ha (50.25 per cent), B. bassiana@ 2.0 kg/ha (49.75 per cent), Azadirachtin 0.001 per cent (41.62 per cent) and NSKE 5 per cent (33.50 per cent).
The highest per cent increase in haulm yield was recorded in the treatment of M. anisopliae@ 2.0 kg/ha (65.08 per cent), followed by Neem oil 2 per cent (56.28 per cent), B. bassiana@ 2.0 kg/ha (52.66 per cent), V. lecanii @ 2.0 kg/ha (45.47 per cent), Azadirachtin 0.001 per cent (38.99 per cent) and NSKE 5 per cent (30.25 per cent).
The treatment of M. anisopliae @ 2.0 kg/ha recorded maximum net realization i.e. 37525 /ha, followed Neem oil 2 per cent (30800 /ha), B. bassiana@ 2.0 kg/ha (27290 /ha), V. lecanii @ 2.0 kg/ha (26800 /ha), Azadirachtin 0.001 per cent (22330 /ha), NSKE 5 per cent (17860 /ha), Tobacco leaf extract 5 per cent (13890 /ha), whereas, minimum net realization was observed in the treatment of Custard apple leaf extract 5 per cent (8275 /ha) followed by Karanj oil 2 per cent (10815 /ha).
The ICBR of different treatments were worked out (Table 14). Among different treatments the highest ICBR i.e. 1: 31.27 was recorded in the treatment of M. anisopliae @ 2.0 kg/ha followed by B. bassiana@ 2.0 kg/ha (1: 22.74), V. lecanii @ 2.0 (1: 22.33), Azadirachtin 0.001 per cent (1: 17.86) and NSKE 5 per cent (1: 11.90).
Whereas, the lowest ICBR was observed in the treatment of Karanj oil 2 per cent (1: 1.97) followed by Tobacco leaf extract 5 per cent (1: 2.53), Custard apple leaf extract 5 per cent (1: 2.76) and Neem oil 2 per cent (1: 4.10).
 
Date 2017-07-15T11:20:17Z
2017-07-15T11:20:17Z
2015-09
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/5810025420
 
Language en
 
Format application/pdf
 
Publisher jau,junagdh