TITLE

Gamma Irradiation to Potentiate Some Bio-agent Compounds against the Cotton Leaf worm, Spodoptera littoralis (Boisd.) (Lepidoptera: Noctuidae)

AUTHOR(S)
Amer, Reda A. M.; Yacoub, Sh. S.; Nouh, Gehan M.; Hatem, A. E.
PUB. DATE
July 2015
SOURCE
Egyptian Journal of Biological Pest Control;2015, Vol. 25 Issue 2, p445
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Efficiency of four bio-agent compounds; Bacillus thuringiensis (Bt), kurs.; Metarhizium anisopltiae, Metsch.; Heterorabditis bacteriophora, Poinar; Steinernema carpocapsae, Weiser and chitosan (biopolymer), exposed to gamma irradiation at doses of 15, 30 and 60 Gy to increase its activity on toxicity, biological and life table parameters of the cotton leaf worm, Spodoptera littoralis (Boisd.) treated as 4th instar larvae was tested. Bt exposed to gamma doses of 15, 30 & 60 Gy had potentiating efficacy on S. littoralis than Bt used alone without exposing to gamma doses. M. anisopltiae and chitosan had nearest results among tested bio-agents singly and the same bioagents exposed to gamma doses. Opposite with H. bacteriophora and S. carpocapsae had antagonism effect against S. littoralis when exposed to aforementioned gamma doses. Bt was the most efficient bio agent compound as compared to other treatments on most biological parameters of S. littoralis, in addition to increasing larval mortality %. Also, the same treatment decreased pupation, moths' emergence and fecundity percentages, ovipositional period, egg laying rate, especially when treated with Bt irradiated with gamma doses of 60 Gy. Other treatments of M. anisopltiae and chitosan had effect on biological parameters of S. littoralis but the result was nearly from those of the same compounds when exposed to gamma doses. Life table parameters affected by different treatments, especially with Bt exposed to gamma dose of 60 Gy. Female progeny/female (Mx), survival rate (Lx), generation time (T), net reproductive rate (Ro), intrinsic rate of natural increase (rm) and finite rate of increase (erm) were decreased in comparison to control. Meanwhile, doubling time (DT) was increased compared to control.
ACCESSION #
112159262

 

Related Articles

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics