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Articles by A.B. Idris
Total Records ( 7 ) for A.B. Idris
  A.B. Idris and O. Emelia
  The development and feeding behaviour of Spodoptera exigua L. (BAW) were studied on different food plants. Five types of plants used were Lycopersicon esculentum var. MT11 (tomato), Allium cepa var. Ascolonium (onion), Abelmoschus esculentus var. MKBe1 (okra), Solanum melongena var. Pintung Long (brinjal) and Capsicum annum var. MC11 (chilli). Development time of S. exigua’s larvae differed significantly among treatments. Development time was shorter for larvae fed on onion and okra compared to other treatments. Interestingly, larva fed on brinjal died on first instar stage. Mean of feacal produced per larvae was differed significantly among treatments. There was a significant and positive correlation (r = 0.9576) feacal between produced and development time of larvae. The number of larvae, pupae, adult emergence and eggs lay differed significantly (p<0.05) among treatments. Survival rate of larvae and fecundity of adult emerged fed on onion and okra were higher than in other treatments. In choice test, the larval feeding time differed significantly among treatments. Larvae were observed to feed only on onion, okra and chilli. In no choice test, larvae were observed to feed on food plants tested including brinjal and tomato. As in choice test, larval feeding time on okra and onion was longer than on other treatments. Similar study on other plants should be conducted to find more plants that could negatively affect development and feeding behaviour of S. exigua. Futher study on the effect of brinjal on egg laying behaviour of S. exigua adults could confirm the possible use of the plant to be intercroped with other crops that is preferred by S. exigua.
  Asmanizar , A. Djamin and A.B. Idris
  A laboratory study to test the bioactivity of Jatropha curcas and Annona muricata seed crude extract against Sitophilus zeamais (Coleoptera: Curculionidae) was conducted by using dipping and surface protectant methods. Both J. curcas and A. muricata seed crude extract had contact and stomach poison against S. zeamais. By dipping method, the weevil mortality were 90 and 70%, respectively at concentration 20% (v/v), whilst by surface protectant method, the weevil mortality was 100% at 0.4% (v/w) concentration for both crude extracts. The J. curcas and A. muricata seed crude extracts applied on rice grain (surface protectant method) can reduced the F1 progeny production, weight loss and rice grain damaged. This result suggests that the J. curcas and A. muricata seed crude extracts may have the potential to be used in controlling S. zeamais infesting stored rice grain.
  Khalid A. Saad , M.N. Mohamad Roff , M.A. Mohd Shukri , Razali Mirad , S.A.A. Mansour , Ismail Abuzid , Y. Mohd Hanifah and A.B. Idris
  Chilli plants release volatile organic compounds following insect or mechanical damage. In laboratory experiments, the behavioural responses of Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) were investigated by using artificially damaged and undamaged chilli plants. The headspace volatiles released by the plants were determined using gas chromatography-mass spectrometry. The results showed that the preference of adult whiteflies varied with the time after damage induction. No significant difference in distribution of whiteflies was noted between artificially damaged and undamaged chilli plants within 1 and 3 h of damage induction. However, whitefly adults preferably aggregated on undamaged chilli plants than on artificially damaged plants after 6 and 24 h of damage induction. Further, the artificially damaged plants were less preferred for subsequent oviposition than undamaged chilli plants. There was a significant quantitative difference (p<0.05) in the levels of volatile monoterpenes, i.e., α-pinene, p-cymene and β-phellandrene, in artificially damaged plants after 24 h of damage induction compared with that in undamaged plants and artificially damaged plants after 1 h of damage induction. The increased emission of these volatile compounds might have altered the preference of whiteflies, leading them to avoid artificially damaged chilli plants.
  H. Asimah , L. Albert and A.B. Idris
  Fumigant toxicity of Ethyl Formate (EF) against four major cocoa storage pests was carried out on a semi commercial trial of two metric ton of cocoa beans under sheet without forced air circulation. The EF with concentration from 76-380 g L1 were studied against pupae, larvae and adult of Cocyra cephalonica and Ephestia cautella (moth) and Tribolium castaneum and Lasioderma serricone (beetles). These stored pests were inserted into a wire mesh tubes 6×1.5 centimeters (cm) and then arranged in a 25×2.5 cm polyethylene tubes and then inserted inside gunny sacks and exposed to the EF gas for 40 h with surrounding temperature and relative humidity (R.H.) recorded throughout the trial of 26±0.3-34±0.4°C and 65±0.4-91±0.2%, respectively. While, the temperature inside the tarpaulin was between 24±0.3-30±0.2°C and the R.H. as minimum of 42±0.4% and maximum of 63±0.3%. The result indicated that complete mortality for all stages of insects was detected at minimum concentration of EF (190 g L1). Different stages and insect species gave difference response to the toxicity level of EF. However, the LC99 value for larvae and pupae of all stages of four insects tested showed no significant different among species except for adults of T. castaneum and L. serricorne. For LC50 value for larvae of L. serricorne, E. cautella and L. serricorne pupae are relatively more susceptible to EF than other two species. The estimated probit regressions were well fitted to the response as the chi-square values for larvae, pupae of four pest and two adults pests tested were not significant at 5% level of confident. The residue of EF was not found in whole beans, nibs and cocoa beans. As such the EF was successfully developed as a fumigant for treatment of pests control for dry cocoa beans.
  A.B. Idris , N. Nor Zaneedarwaty , A.D. Gonzaga , M.I. Zaidi , S. Azman and Y. Salmah
  A study on four methods of sampling Ichneumonidae and Braconidae at two different habitats of Fraser`s Hill was conducted from 12 - 15 November 2000. The sampling methods tested were malaise trap (MT), yellow pan trap (YPT), flight intercept trap (FIT) and sweeping net (SWN). YPT collected the most ichneumonids while FIT collected similar numbers of ichneumonids and braconids. MT seemed to collect less ichneumonids individuals as compared with other two methods, but had high H` for ichneumonid morphospecies, indicating that MT is relatively a better method for estimating diversity over the other methods. None of the tested sampling methods has better edge over the others in collecting ichneumonids and braconids irrespective of habitat types. As such, the use of all suitable sampling methods for certain habitats per unit time are still the best suggestion in order to get enough collection and better diversity of estimation especially for ichneumonids.
  A.B. Idris and A.S. Sajap
  The abundance of scuttle fly (phorid flies) was studied in the selected forest habitats of Peninsular Malaysia in 1996 and 2000, respectively. The scuttle flies were more abundant in the undisturbed than in the disturbed forests. A total of 26-phorid genera were collected and this was estimated to be 11.4% of the total phorid genera worldwide. This study also successfully collected 21.7% (12 genera) of the total genera recorded from Oriental and Australasian region (55 genera) and 33.3% (5) of the total genera recorded from Malaysia (15). The individuals of genera Megaselia and Woodiphora were the most abundant as compared to other 24 genera recorded. The ratio for the total Megaselia to Woodiphora (M:W) individuals indicated that the less disturbed forests had higher M:W ratio than the more disturbed forests. The potential of Megaselia and Woodiphora to be used as biological indicator of forest disturbance are discussed.
  A. Nur Azura and A.B. Idris
  Fifty eight species and one subspecies of Cryptinae were recorded in Malaysia, consisting of 31 genera. The type specimens were deposited in various depository centers.
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