Laboratory experiments on microbial control of Pityogenes chalcographus L. (Col. scolytidae) with entomopathogenic fungi
Laboratory experiments on microbial control of Pityogenes chalcographus L. (Col. scolytidae) with entomopathogenic fungi
G. A. Bajwa, R. Kehr and G. Zimmermann
ABSTRACT
The entomogenous fungi Beauveria bassiana (Bals) Vuill.
(Bba 3), Metarhizium anisopliae (Metch) Sorok, (Ma 3, Ma
6 and Ma 43), Paecilomyces fumosoroseus (Wize) Brown et
Smith (Pfr 11) and P. cicadae (Miquel) Samson (Pc 3)
were tested in the laboratory for virulence on
Pityogenes chalcographus. 20 adults of P. chalcographus
contaminated with conidia by releasing on agar plates
for two minutes were reared on bark of Picea abies (4 x
4 cm). B. bassiana, M. anisopliae (Ma 3, Ma 6, Ma 43)
and P. fumosoroseus caused 100 percent mortality within
10 days, while in control and P. cicadae that was 20 and
30 percent, respectively. Conidial suspensions of B.
bassiana (Bba 3), M. anisopliae (Ma 6) and P.
fumosoroeus (Pfr 11) in Tween 80 (0.1%) were sprayed at
the concentration of 2 x 107 conidia/ml on logs (40 cm x
15-20 cm dia) of P. abies. 410 P. chalcographus adults
were released in each treatment and mortality was
estimated from the emergence of adults in next
generation. Population in next generation was reduced in
the order, B. bassiana (46.9%), M. anisopliae (15.1%)
and P. fomusoroseus (1.4%).
To share on other social networks, click on any share button. What are these?
December 1994
Vol. 44, Iss. 4
