Showing papers on "Dacus published in 1998"
TL;DR: A total of 44 species are placed in the genus Dacus inSouth-east Asia and divided amongst four subgenera, viz.Callantra Walker, Dacus Fabricius,DidacusCollart and LeptoxydaMacquart, with the following 17 new species described.
Abstract: A total of 44 species are placed in the genus Dacus inSouth-east Asia and divided amongst four subgenera, viz.Callantra Walker, Dacus Fabricius,DidacusCollart and LeptoxydaMacquart. In all, 27 species are revised and the following 17 new speciesdescribed: Dacus (Callantra)ambonensis, D.(C.) atrimarginatus,D. (C.)calirayae, D.(C.)feijeni,D. (C.)insulosus, D.(C.) lagunae,D. (C.)leongi, D.(C.) maculipterus,D. (C.)murphyi, D.(C.) nanggalae,D. (C.)ooii, D.(C.) ramanii,D.(C.)siamensis,D. (C.)tenebrosus, D.(C.) vijaysegarani,D. (C.)wallacei, Dacus(Dacus) santongae. A key tospecies within the genus Dacus is presented based oncharacters that bypass subgeneric groupings, because of the presentuncertainty of subgeneric limits. Information is given on location of typespecimens, host plants, attractant records and geographic distributions.Lectotypes are designated for D. conopsoides de Meijere, D. esakii (Shiraki),D. icariiformis Enderlein andD. persicus Hendel. Thirteen new synonymies withinDacus are established:Callantra ihai Shiraki [ofDacus esakii (Shiraki)];Callantra smieroides Walker,Mellesis destillatoria Bezzi,Mellesis eumenoides Bezzi,Mellesis bioculata Bezzi,Callantra unifasciatus Hardy,Callantra variegata Wang (all ofDacus longicornis Wiedemann);Mellesis apicalis Shiraki [ofDacus nummularius(Bezzi)];Callantra munroi Zaka-ur-Rab,Callantra nepalensis Hardy,Callantra quadristriata Munro [all ofDacus polistiformis (Senior-White)];Callantra ziae Wang [ofDacus satanas (Hering)];Dacus cocciniae Premlata & Awtar Singh (ofDacus ciliatus Loew).Dacus persicus Hendel is removed from synonymy withD. longistylus Wiedemann.Sinodacus fuscans Wang is placed as a new synonym ofBactrocera brachycera(Bezzi).
29 citations
1 Jan 1998
TL;DR: In this article, the male oriental fruit fly Dacus dorsalis was studied using a horizontal wind tunnel and 2,3,5 trimethyl pyrazine was applied to the flies.
Abstract: Anemotactic responses of the male oriental fruit fly Dacus dorsalis to 2,3,5 trimethyl pyrazine were studied using a horizontal wind tunnel. Various concentrations of the chemical compound had significant effects on the behavioural activities of the males but, very high concentrations of the chemical inhibited all their activities. Maximum number of flies landed on the source in response to I0 u l of the chemical. The flies showed an increase of flight activity (orthokinesis) in response to the stimulation. In moving air, the flies apparently located the chemical source using odour-modulated upwind anemotaxis. Two types of anemotaxis were observed in the present study.i.e. positive anemotaxis (straight upwind flights) and reversing anemomenotaxis (zigzagging upwind flights). Males performed both types when the odour was presented as a plume, but exhibited only zigzagging anemotaxis in the uniformly dispersed odour. A relatively lower concentration (l ul) caused the flies to produce maximum number of zigzagging anemotactic flights whereas a higher concentration (1Oul ) elicited the highest number of straight flights in males. 2,3,5 trimethy I pyrazine had marked effects on males causing them to orient towards the source (attraction) with the aid of upwind anemotaxis and to land (arrestment) on it.
3 citations
1 Jan 1998
TL;DR: It is shown that parasitoid eggs laid on host larvae at their seventh day of ovo-larval development are able to produce adult parasitoids, and number of adult emergencies is lower man when the eggs are laid on older larvae.
Abstract: JIMENEZ, A.; CASTILLO, E.; BEITIA, F. J. y ESTEBAN, J. R., 1998: Parasitism estimation of Opius concolor Szepligeti on Bactrocera (=Dacus) oleae (Gmelin) in laboratory conditions. Bol. San. Veg. Plagas, 24(Adenda al n.° 4): 889-896. Opius concolor Szepl. (Hymenoptera: Braconidae) is a parasitoid used in biological control programs of the olive fly, Bactrocera oleae Gmel. (Diptera: Tephritidae). In the laboratory, it is reared on old medfly larvae (Ceratitis capitata Wied.; Diptera: Tephritidae) as substitutive host. Several tests that have been carried out to assess the percentage parasitism of Opius concolor on Bactrocera oleae larvae, as well as the degree of success of inmature development of parasitized Bactrocera oleae larvae inside the fruit. In this paper it is demonstrated that the efficiency of parasitism is related to larval host age, being maximum towards the end of larval host's growth. Furthermore, it is shown that parasitoid eggs laid on host larvae at their seventh day of ovo-larval development are able to produce adult parasitoids. In our trials, however, number of adult emergencies is lower man when the eggs are laid on older larvae.
2 citations
1 Jan 1998
TL;DR: The results make evident the validity of the RAPD-PCR technique for characterization and unambiguous identification of insects, with the obvious derived advantages for pest control management.
Abstract: CALLEJAS, C ; RODA, P.; REYES, A. y OCHANDO, M. D., 1998: Identificacion genetica de Dacus -Bactroceraoleae Gmelin (Diptera: Tephritidae) mediante marcadores RAPD-PCR. Bol. San. Veg. Plagas, 24(Adenda al n.° 4): 873-882. The introduction of molecular genetic methodologies in the field of applied entomology, can offer us an unique opportunity for unambigous identification of species, as well as for the characterization of races, biotypes and populations. In the present work, we have used the RAPD-PCR tecnique, to genetically identify two population samples of Dacus -Bactroceraoleae, one from Jaen, and the other from Sevilla. A total of 30 adult flies from each population were screened with 7 diferent primers. From the 94 obtained bands, 17 were present in all the analyzed individuals, 11 only present in one or the other population, however in very low frequencies, and the rest were variables. The results make evident the validity of the RAPD-PCR technique for characterization and unambiguous identification of insects, with the obvious derived advantages for pest control management.
1 citations