Witjaksono .
Universitas Gajah Mada

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Relationship Between Pod Characteristics of Some Cocoa Clones (T. cacaoL.) and Their Resistance Response to Cocoa Pod Borer Wahyu Susilo, Agung; Mangoendidjojo, Woerjono; ., Witjaksono
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 23, No 3 (2007)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Abstract

Characteristic study on CPB resistance had been carried out by characterizing mesocarp layer of cocoa pod where egg laying and larva penetration are carried out. For this study, 4 clones were selected which performed different response to CPB, namely resistant clones of KW 514 and ARDACIAR 10, moderately resistant clone of KW 411 and the susceptible clone of RCC 72. Pod samples were classified as young and mature were detached from cocoa collection at the experimental station of Kaliwining, Indonesian Coffee and Cocoa Research Institute in Jember. Characterization was conducted based on microchemical method at the Microtechnique Laboratory of Gadjah Mada University to identify trichome appearance at upper layer of pod, distributed granules of tannin through mesocarp and lignification of the sclerotic. It was characterized that the trichome density performing resistant in which the resistant and moderately resistant clones had more number of trichome density than of the susceptible one. The distributed granules of tannin at young pod showed significant difference among those clones that indicate resistant characteristics. The number of distributed granules of tannin was higher of those the resistant and moderatly resistant clones than of the susceptible clones that were formed both at furrow and at ridge of pod. However, the granules of tannin were distributed more at ridge than at furrow where furrow were preferred by CPB for egg laying. The characteristic differences between the resistant and moderately resistant clones were identified based on the intensity of lignification at sclerotic tissue. The lignified tissue of the resistant clones perform more intensive and more compact than of the moderately resistant clones. Tissue of young pod of the moderately resistant and susceptible clones was not yet lignified. Thickness of lignified tissue at the furrow of resistant clone was higher than of the moderately resistant and susceptible clones. Key words : Theobroma cocoa L.,cocoa pod borer, resistant, mesocarp, sclerotic, trichome, tannin.
DAYA MAKAN, DIAPAUSE DAN MOBILITAS KEONG MAS (POMACEA CANALICULATA) PADA BERBAGAI KEDALAMAN AIR Bunga, Jacqualine Arriani; Wagiman, Franciskus Xaverius; ., Witjaksono; Sidadolog, Jafendi Hasoloan Purba
JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA Vol 16, No 2 (2016): SEPTEMBER, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA

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Abstract

Feeding rate, aestivation and mobility of golden snails (Pomacea canaliculata) at different depths of water. The research was studied in Malaka District, East Nusa Tenggara Province, during the dry and the rainy season (October 2014 - March 2015). Studies on capacity of damage to the Ciherang rice seedlings were carried out for three weeks. The size of snails used in this experiment was 11-20; 21-30; and 31-40 mm. The numbers of seedlings that were planted were 3, 6, 9, 12, 15, 18 and 21 seeds. The treatments were repeated 5 times. The numbers of seeds which are damaged by the snails then were tabulated and analyzed. Snails with the size of 11-20 mm damaged the seeds in 31.67%, followed by snails with the size of 21-30 mm and 31- 40 mm with potency of damaging were 64.76% and 97.38%, respectively. The size of snails affects the level of damage to rice seedlings when transplanting. Study about aestivation was conducted in five villages, namely Kamanasa, Wehali, Umakatahan, Harekakae and Kletek when the rice fields were fallow. The observation point was observed at the corner of the dike and along the dike, evaluated every 10 meters away. The results showed snails aestivate when the fields were dry. Studies on snail’s mobility conducted on the experiment arena on the mud in buckets, which planted with 20 paddy seedlings. The treatment depth of puddles in the experiment were without puddles, half, the same height and twice the height of snails shell. The treatments were repeated 10 times. Measurement of snail’s mobility was performed routinely every 2 hours, observed from the beginning when the snails were placed for 24 hours in advance. The results showed that the depth of the water significantly affected the mobility of snails. Without puddles, the mobility of snails was severely hampered in the mud. The mobility of the juvenile was significantly higher than the imago. The implication of this study was benefit to that the regulating the level of water in the paddy field which is known as an appropriate effective technology and for controlling the attack of the golden snails.
DAYA MAKAN, DIAPAUSE DAN MOBILITAS KEONG MAS (POMACEA CANALICULATA) PADA BERBAGAI KEDALAMAN AIR Bunga, Jacqualine Arriani; Wagiman, Franciskus Xaverius; ., Witjaksono; Sidadolog, Jafendi Hasoloan Purba
JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA Vol 16, No 2 (2016): SEPTEMBER, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (250.379 KB) | DOI: 10.23960/j.hptt.216147-154

Abstract

Feeding rate, aestivation and mobility of golden snails (Pomacea canaliculata) at different depths of water. The research was studied in Malaka District, East Nusa Tenggara Province, during the dry and the rainy season (October 2014 - March 2015). Studies on capacity of damage to the Ciherang rice seedlings were carried out for three weeks. The size of snails used in this experiment was 11-20; 21-30; and 31-40 mm. The numbers of seedlings that were planted were 3, 6, 9, 12, 15, 18 and 21 seeds. The treatments were repeated 5 times. The numbers of seeds which are damaged by the snails then were tabulated and analyzed. Snails with the size of 11-20 mm damaged the seeds in 31.67%, followed by snails with the size of 21-30 mm and 31- 40 mm with potency of damaging were 64.76% and 97.38%, respectively. The size of snails affects the level of damage to rice seedlings when transplanting. Study about aestivation was conducted in five villages, namely Kamanasa, Wehali, Umakatahan, Harekakae and Kletek when the rice fields were fallow. The observation point was observed at the corner of the dike and along the dike, evaluated every 10 meters away. The results showed snails aestivate when the fields were dry. Studies on snail’s mobility conducted on the experiment arena on the mud in buckets, which planted with 20 paddy seedlings. The treatment depth of puddles in the experiment were without puddles, half, the same height and twice the height of snails shell. The treatments were repeated 10 times. Measurement of snail’s mobility was performed routinely every 2 hours, observed from the beginning when the snails were placed for 24 hours in advance. The results showed that the depth of the water significantly affected the mobility of snails. Without puddles, the mobility of snails was severely hampered in the mud. The mobility of the juvenile was significantly higher than the imago. The implication of this study was benefit to that the regulating the level of water in the paddy field which is known as an appropriate effective technology and for controlling the attack of the golden snails.
THE PREFERENCES AND DISTRIBUTION OF SUGARCANE SCALE INSECT AULACASPIS TEGALENSIS (HEMIPTERA: DIASPIDIDAE) ON DIFFERENT CLONES OF SUGARCANE Pramono, Sudi; Wagiman, Franciscus Xaverius; Trisyono, Yohanes Andi; ., Witjaksono
JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA Vol 20, No 1 (2020): MARCH, JURNAL HAMA DAN PENYAKIT TUMBUHAN TROPIKA
Publisher : Universitas Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/j.hptt.12046-53

Abstract

This research was conducted in the field of Gunung Madu Plantations Co., Gunung Batin, Lampung Tengah, in the period of April 2015?May 2016. The experiment was arranged in a randomized completely block design with six sugarcane clones as treatments (GMP 1, GMP 2, RGM 99.370, RGM 97.8837, GMP 3, and GMP 4) and four blocks, every block was separated by the street. The abundance of sugarcane scale insects was observed in 15-day intervals from the plant ages of 4 to 12 months. The results showed that sugarcane clone affected the abundance of sugarcane scale insects. After a lag phase of six months (fifth observation), the sugarcane scale insects started being found on all six sugarcane clones in the field. The abundance of the scale insects then increased and peaked at 10.5 months. The sugarcane scale insects attacked all six clones of sugarcane. Clone GMP 1 was the most preferred with an average scale abundance at 814.4 individuals/stem while the least preferred clone was GMP 4 with average of 179 individuals/stem.