protection of rubber wood from insect borers - Kerala Forest ...

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undle was exposed to laboratory bred cultures of powder-post beetles bykeeping the bundle in the trough containing the culture. The remainingtwo bundles were stacked in the storage yards of rubber wood industrialunits at Ollur (Evershine Industries) and Kodumon (Plantation Corporationof Kerala) exposing them to natural Infestation. It may be noted here thatresidual population of different species of borers was already present in thelogs and scraps accumulated in the factory premises. Monthlyobservations were made for a period of one year.Table 2. Chemicals and doses used in the third trial using planksTreatment No.Treatments (%)II1 Chlorpyriphos 20 EC* (0.1) + BAE (10 %)2 Chlorpyriphos 20 EC (0.2 )+ BAE (10 %)3 Chlorpyriphos 20 EC (0.5) + BAE (10 %)4 Fenvalerate 20 EC (0.01) + BAE ( 10 %)5 I Fenvalerate 20 EC (0.05) + BAE (10 %)6 Fenvalerate 20 EC (0.1) + BAE (10%)7 Cypermethrin 25 EC (0.01) + BAE (10 %)8 I Cypermethrin 25 EC (0.05) + BAE (10 %)9 Cypermethrin 25 EC (0.1) + BAE( 10 %)10 Control (untreated planks)II* EC-Emulsifiable concentrateExperiment using veneersA set of three experiments using veneers was carried out to determine thethreshold values of salt retention in treated rubber wood in order to affordprotection from insect borers. Veneers of 1.5 mm thickness and of 200 mmx 50 mm size peeled from fresh logs of rubber wood were used. Fifteenveneers were made into a bundle and for each treatment 3 such bundleswere used. The treatment was carried out by immersing the bundles in therespective chemical solution for 15 minutes. In the case of control. theveneers were immersed in water. After treatment, the veneers were driedand made into three bundles in such a way that each bundle containedsamples of all the treatments. The bundles were tested both in thelaboratory as well as in the field as done earlier and monthly observationswere made for a period of one year.8
Apart from insect damage, fungal attack is also frequently a seriousproblem for the successful utilisation of rubber wood. Therefore, in thisstudy attempts were also made to screen a combination of an insecticideand fungicide. Earlier, NaPCP (Sodium penta chlorophenate) was tried incombination with boric acid for protection against fungal attack. However,because of its high toxicity and harmfui effects, NaPCP is currently bannedand hence a relatively safe fungicide, Chlorothalonil was tested incombination with boric acid, Chlorpyriphos and Fenvalerate. Doses ofchemicals used are given in Table 3.Table 3. Chemicals and doses used for treatment of veneers* EC-Emulsifiable concentrate*W-Wettable powderCalculation of dry salt retention(DSR) in the treated woodThe chemicals retained by the wood after treatment determine the level ofdeterrence to biodegrading organisms. Rubber wood being highlypermeable, the chemical get easily absorbed when the wood is immersed inthe treatment solution. The chemical solution pick up of the sample wascalculated by dividing the weight difference due to treatment by the volume9
Page 2 and 3: CONTENTSPage FileAbstract 1 r.189.2
Page 5 and 6: etc. The beetles are brown in colou
Page 7: (Platypus solidus Wlk. and P. latif
Page 12 and 13: of the sample and is expressed in t
Page 14 and 15: Table 5. Insect activity recorded i
Page 16 and 17: Field trialsObservations made each
Page 18 and 19: CONCLUSIONSnsect attack coupled wit
Page 20: McQuire, A. J. (19621. Stain and mo

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