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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

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