physicochemical
Contents of 39(1 & 2) 2011 - acharya ng ranga agricultural university
Contents of 39(1 & 2) 2011 - acharya ng ranga agricultural university
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ABSTRACTS<br />
“Reaction of Urdbean [Vigna mungo (L.) Hepper] genotypes to thrips and their<br />
seasonal occurrence”<br />
Student : P. Nagaraju<br />
Major Advisor: Dr. G. Raghavaiah<br />
Department of Entomology<br />
Studies on the “Reaction of urdbean (Vigna<br />
mungo (L.) Hepper) genotypes to thripas and their<br />
seasonal occurrence” were undertaken during Kharif,<br />
2007 and Rabi 2007-2008 at Regional Agricultural<br />
Research Station, Lam farm, Guntur. Seventy six<br />
genotypes of rdbean were selected for screening and<br />
replicated 4 times in a simple Randomized Block Design.<br />
The plant height (cm) varied from 11.8 (IC281990) to<br />
34.6 (IC343936) per plant and differed significantly.<br />
Number of leaves on different genotypes varied from<br />
6.2 (IC26179) to 11.6 (IC436509) Nine genotypes viz.,<br />
IC43 6789, IC398993, IC436585, IC281981, IC261179,<br />
IC436543, IC436922, IC281975, and /wBG37 showed<br />
moderate preference to thrips and moderate resistance<br />
to PBNV. Eight genotypes viz.,IC519684M IC519678,<br />
IC436638M IC436734, IC519685, showed high<br />
preference to thrips and moderate resistance to PBNV.<br />
The seasonal incidence of thrips during Kharif<br />
2007, indicated that July and August moths were<br />
favorable for the multiplication of T. palmi. The peak<br />
incidence of T.palmi was recorded during the 33 rd<br />
standard week (i.e..Aug 13-19, 2007) in Kharif while in<br />
Rabi 2007-2008, December and January months were<br />
favourable for the multiplication of T. palmi and the peak<br />
incidence was during 52 nd standard week (i.e..at Dec<br />
24-31m 2007).<br />
The colour preference of thrips as the mean<br />
catches of T. palmi in different colour traps was studied<br />
during Kharif, 2007, The trap catches of thrips was<br />
highest in pink trap followed by white, blue, yellow,<br />
orange and green traps. M.Sc (Ag), 2008<br />
“Evaluation of some plant extracts against pest complex of cauliflower<br />
(Brassica oleracea var. botrytis L.)”<br />
Student : B. Viswanadha Rao<br />
Major Advisor : Dr. G. Ramachandra Rao<br />
Department of Entomology<br />
A field experiment entitled “Evaluation of some<br />
plant extracts against pest complex of cauliflower<br />
(Brassica oleracea var. botrytis L,)” was undertaken<br />
during Rabi2007-2008 at Agricultural College Farm,<br />
Bapatla as well as in the Department of Entomology.<br />
The evaluation of efficacy of insecticides<br />
revealed tat NSKE 5% was found highly effective against<br />
S. litura, P. xylostellaa and L. erysimi. The next best<br />
treatment was M. azedarach leaf extract 5% followed by<br />
P. glabra leaf extract 5% and were found highly effective<br />
against S. litura and P. xylostella. In case of L. erysimi<br />
the next best treatment was P. glabra leaf extract 5%<br />
followed by M. azedrach leaf extract 5%. All the<br />
remaining treatments viz., 5% leaf extracts of C. inerme,<br />
A. squamosa, P. hysterophrus, L. camera, M. koenigii, I.<br />
cornea, E. officinalis have showed poor performance<br />
against S. litura, and P. xylostella L. erysimi but were<br />
significantly superiou over untreated check. The effect<br />
of these treatments (at different concentrations viz.,0.1,<br />
.5, 1.0, 3.0 and5.0%) was also tested on the growth and<br />
development of third instar larvae of S. litura in the<br />
laboratory. The repellent and antifeedant property of all<br />
the plant extracts viz.,5% leaf extracts of C. inerme, P.<br />
glabra, A. squamosa, P. Hsterophorus, M. azedarach, L.<br />
camera, M. koenigii, E. officinalis and neem seed kernel<br />
extract was enhanced with increase in their concentration<br />
(0.1 to 5.0%) and maximum efficacy was observed at<br />
5.0 per cent concentration.<br />
Among the different plant extracts, NSKE was highly<br />
inhibitive and suppressed the growth and development<br />
of S. litura followed by M. azedarach leaf extract and P.<br />
glabra leaf extract. Similarly the developmental period<br />
increased and the adult emergence, growth index,<br />
survival index, weight of larva and pupa, larval weight<br />
index and pupal weight index decreased as the<br />
concentration of plant extracts increased from 0.1 to 5.0<br />
per cent. M.Sc (Ag),2008<br />
93