|Abstract or Summary
- The goal of this project was to develop an integrated pest management strategy
for the control of a powder-post beetle (Dinoderus minutus F.). This species causes
serious damage in Philippine bamboo. Developmental threshold and thermal constants
were examined and natural enemies and ftmgi associated with beetles were investigated.
Finally, the seasonal beetle occurrence and costs and benefits of prophylactic treatments
to control the damage were investigated under Philippine conditions.
Female powder-post beetles deposited eggs mainly in the metaxylem at an
average of 9.1 eggs per day. The average development periods for eggs, larva, pupa and
egg to adult were 5.4, 43.8, 4.6 and 53.6 days, respectively, at 30 °C.
An unknown mite species caused 88% mortality to eggs and could prove to be a
potential biocontrol for the beetle. Spores of Beauvaria bassiana and Metarrhizium
anisopliae topically applied or sprayed at higher spore concentrations (1:10 and 1:100)
caused significant mortality to D. minutus and could regulate beetle populations.
Imperfect fungi constituted the major fungi isolated from the beetles. Further
studies are suggested to determine the relationship between these fungi and D. minutus.
Beetle populations generally peaked from February to early June and were low to
non-existent in July to October in the period studied (1998 - 2000). Bamboo starch
content and temperature significantly influenced beetle populations. Starch was the major
determinant factor in the regression model [(Y/starch = -106.57 + 27.43(starch)]
developed to predict beetle population. The linear relationship between temperature and
starch production in bamboo culms suggested that monitoring temperature may be a
practical method to predict beetle occurrence.
Application of 0.0001% a.i. deltamethrin in water or kerosene to freshly cut culms
provided complete protection for five weeks against beetle attack. Supplemental
treatment may be applied after that protection period. Kerosene or paraffin alone did not
increase insecticidal efficacy.
The economic benefits of prophylactic treatment were twelve times greater than
the added cost of treatments demonstrating the value of treatment for maintaining
bamboo quality. Losses due to beetle damage will be further reduced once the results of
this study are incorporated in a pest management program.
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