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STUDIES ON NUTRITIONAL ASPECT OF FACTITIOUS HOST Corcyra cephalonica (STAINTON) AND PARASITIZATION POTENTIAL OF EGG PARASITOID Trichogramma chilonis (ISHII) UNDER SOUTH GUJARAT CONDITIONS

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Title STUDIES ON NUTRITIONAL ASPECT OF FACTITIOUS HOST Corcyra cephalonica (STAINTON) AND PARASITIZATION POTENTIAL OF EGG PARASITOID Trichogramma chilonis (ISHII) UNDER SOUTH GUJARAT CONDITIONS
 
Creator MEHENDALE, SHEKHAR K.
 
Contributor PATEL, M.B.
 
Subject eggs, developmental stages, biological interaction, sorghum, yeasts, research methods, parasites, biological phenomena, insecticides, sexual reproduction
 
Description Investigation on ?Nutritional aspect of factitious host
Corcyra cephalonica (Stainton) and parasitization potential of egg
parasitoid Trichogramma chilonis (Ishii) under South Gujarat
conditions? was undertaken at Bio-control laboratory, Department of
Agril. Entomology, N.M. College of Agriculture, Navsari, Navsari
Agricultural University during June 2007 to March 2008.
Suitability of rearing media in view to improve the mass
production of C. cephalonica revealed three promising media viz., T3
(sorghum + groundnut + powdered yeast ), T4 (sorghum + gram +
powdered yeast ) and T6 (sorghum + cowpea + powdered yeast ) with
heavier larvae in T3 (53.33 mg), T4 (52.50 mg) and T6 (54.50 mg)
where all were at par. Heavier pupae recorded in T4 (34.67 mg), T6
(34.17 mg) and T3 (33.17 mg), heavier female moths emerged in T3
(39.33 mg), T4 (34.83 mg) and T6 (34.0 mg), maximum total moths
recorded in T3 (523.84), T4 (476.34) and T6 (470.0), maximum total
female moths noticed in T3 (266.17), T6 (251.50) and T4 (243.34),
maximum fecundity recorded in females emerged from T3 (611.54), T4
(494.28) and T6 (481.08), maximum projected egg laying from the
females emerged from T3 (8.14 cc), T6 (6.10 cc) and T4 (6.01 cc) ,
maximum 100-egg weight of the females emerged from T4 (3.73 mg),
T6 (3.70 mg), Maximum egg length and width of eggs obtained from
females emerged from T4 (0.70 and 0.40 mm), T6 (0.62 and 0.39 mm)
and T3 (0.56 and 0.35 mm), respectively. However no much effect on
the life cycle of C. cephalonica through modification of rearing
media was noticed but female influenced sex ratio was noticed in T3
(1:0.97), T4 (1:0.96) and T6 (1:0.87)
Effect of Corcyra eggs obtained from females emerged from
different media on T. chilonis performance realized that highest per
cent egg parasitization was recorded in T3 (94.70 %), T4 (92.65 %) and
T6 (90.48 %). Maximum no of parasitoids recovered from total
parasitized eggs were in T3 (94.76), T4 (92.24) and T6 (89.75),
maximum per cent female emergence from eggs of Corcyra obtained
from females emerged from media T6 (80.55%), T4 (79.71%) and T3
(69.505%). Sex ratio revealed female preponderance in T6 (1:4.06), T4
(1:3.94) and T3 (1:2.28). Female parasitoid longevity was the
maximum from eggs of Corcyra females emerged from T3 (4.47 days),
T6 (4.33 days) and T4 (4.30 days).
Effect of adult nutrition on performance of T. chilonis
revealed that maximum per cent egg parasitization was recorded in
females fed on Castor pollens (92.75 %), Corcyra egg extract (91.0
%) and milk powder solution 10 per cent (89.57 %). Female and male
parasitoid longevity was the maximum in sucrose 10 per cent (5.73
and 3.53 days), respectively. Sex ratio after adult emergence from
Corcyra eggs parasitized by parasitoid female fed on Corcyra egg
extract was (1:1.71) followed by milk powder 10 per cent solution
(1:1.60) and maximum per cent females from Corcyra eggs parasitized
by parasitoid female fed on Corcyra egg extract (62.96 %) followed by
milk powder 10 per cent solution (61.38 %).
Effect of different colour trichocards on the performance
of T. chilonis revealed that for mass production of the parasitoid in
the laboratory trichocard of green colour was most suitable based on
results of free choice open light condition.
Effect of host egg age on the performance of T. chilonis
revealed that egg age from 0 to 1 to 24 to 25 h old were highly
preferred for parasitization with maximum female recovery in egg age
0 to 1 to 18 to 19 h old. Parasitization potential of the emerged
female from different egg age was maximum in 0 to 1 to 18 to 19 h
old where the emerged females could retained their parasitization
potential up to 3 days with a range of 88 to 70 per cent.
Studies on insecticide safeties to T. chilonis realized that
no insecticide was totally safe in contact toxicity study however; the
ranking allotted indicated that novaluron 10 EC 0.0075 per cent was
slightly harmful (Rank 2) while emmamectin benzoate 5 SG 0.001 per
cent and endosulfan 35 EC 0.075 per cent were moderately harmful
(Rank 3) while remaining all were totally harmful (Rank 4). Insecticide
safeties to egg parasitization revealed that based on the ranking,
imidacloprid 17.8 SL 0.005 per cent, acetamiprid 20 SP 0.004 per
cent, acephate 75 SP 0.1 per, emmamectin benzoate 5 SG 0.001 per
cent and novaluron 10 EC 0.0075 as harmless (Score 1= < 30 %
reduction in egg parasitization over control), triazophos 40 EC 0.05
per cent and cypermethrin 25 EC 0.005 per cent as moderately
harmful (Score 3 = 80-99 % reduction in egg parasitization over
control) while, fenobucarb 50 EC 0.1 per cent and endosulfan 35 EC
0.075 per cent, the only harmful ( Score 4 = >99 % reduction in egg
parasitization over control ). Effect of insecticides on adult
emergence revealed that based on the ranking given no insecticide
was found safe to developing adult Trichogramma inside the egg.
Insecticides like triazophos 40 EC 0.05 per cent, acetamiprid 20 SP
0.004 per cent, acephate 75 SP 0.1 per, emmamectin benzoate 5 SG
0.001 per cent, novaluron 10 EC 0.0075 per cent and endosulfan 35 EC
0.075 per cent were slightly harmful (Score 2 = 30-79 %
reduction), imidacloprid 17.8 SL 0.005 per cent as moderately toxic
(Score 3= 80-99% reduction) and fenobucarb 50 EC 0.1 per cent as the
most toxic one (Score 4 = >99 % reduction). Results of the suitability
of host eggs for mass production of T. chilonis revealed that the
parasitoid could effectively reared on eggs of Earias vittella (Fab.)
and Helicoverpa armigera (Hb.) as these two hosts supported higher
egg parasitization and parasitization potential of the emerged female
back on the eggs of C. cephalonica.
Host searching ability of T. chilonis in different crops under
field condition revealed that carrot (73.15 %); castor (72.19 %) and
mustard (71.93 %) supported the highest per cent Corcyra egg
parasitization. However, it failed to search host in gram and Indian
bean.
Effect of cold storage at 150C temperature for varying
period on already parasitized egg cards, 4 days after parasit ization
revealed that parasitized trichocards after 4 days of parasitization
can effectively be stored upto 30 days without much effect on adult
emergence.
 
Date 2016-03-10T13:43:34Z
2016-03-10T13:43:34Z
2009-01
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/65040
 
Language en
 
Format application/pdf
 
Publisher Navsari Agricultural University, Navsari