Bekti Andayani
Universitas Jember

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The side effect of Paecilomyces fumosoroseusapplication on the black ant, Dolichoderus thoracicus, the predator of Helopeltis antoniiand cocoa pod borer Sulistyowai, Endang; Mufrihati, Endang; Andayani, Bekti
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 22, No 2 (2006)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Abstract

Paecilomyces fumosoroseuswas known as one of the effective biological agents of cocoa pod borer and Helopeltis antonii. To find out the side effect of application of P. fumosoroseuson black ant, Dolichoderus thoracicus, a series of observations were carried out at the Laboratory of Pest and Diseases Indonesian Coffee and Cocoa Research Institute (ICCRI) and in a cocoa plantation of Glenmore, Banyuwangi district, since June until October, 2004. Laboratory research used four concentrations of P. fumosoroseusnamely 105, 106, 107 and 108 spores/ml, while in the field used concentration 2, 4, 6, 8 g dry spores/ml. Each trial as compared with spraying of carbamate and synthetic pyrethroid insecticides as control and untreated This research was designed by randomized block design and four replications. The results showed that in the laboratory, direct spraying suspension of P. fumosoroseuskilled black ant between 20—39% which infected fungi about 2.5—12.5%. The relationship between log of spores concentration of P. fumosoroseus and probit of ant mortality followed the regression equation Y = 3.653 + 0.097 X with LC 50 was 8 x 10 13 spore/ml. The period needed to kill a half of ant population at the laboratory (LT 50) at concentration 107 spores/ml followed the regression equation Y = 1.851 + 1.522 X, with LT50 is 12,01 days. The effect of pyrethroid and carbamate insecticide on ants mortality were 91.25% and 98.75% respectively. In the field, the effect of P. fumosoroseusspray on black ant population was very low, with the percentage of ant mortality at cocoa leaf nest were 0.25–0.46% and at cocoa leaf nest in plastic bag were 0.06–0.21%, while carbamate and pyrethroid synthetic effect were 37.35% and 52.37% at cocoa leaf nest, and 19.15% and 46.67% at cocoa leaf nest in plastic bags. Key words : Cocoa, capsid, Helopeltis antonii, biological control, biological agents, Paecilomyces fumosoroseus, Dolichoderus tharacicus.
Distribution of Radopholus similisand Pratylenchus CoffeaeNematodes in Coffee Plantation Hulupi, Retno; ., Mulyadi; Andayani, Bekti
Pelita Perkebunan (Coffee and Cocoa Research Journal) Vol 23, No 3 (2007)
Publisher : Indonesian Coffee and Cocoa Research Institute

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Abstract

A research to evaluate the difference of damage levels caused by two species nematodes, Radopholus similis and Pratylenchus coffeae on Arabica and Robusta coffee which were planted in the same endemic area have been conducted at Kalibendo (700 m asl. climate type B) and Blawan coffee estate (1200 m asl., climate type D) for two years. The results showed that in the medium highland (700 m asl.) R. similis attacked Arabica coffee with necrotic root scale higher than surface Robusta coffee. Distribution of R. similis population in the 50 cm depth below soil surface was likely with their root distribution. On the other hand P. coffeae in 30 cm depth below soil therefore their resistance to R. similis was more likely due to the escape reason, as result of their different distribution population of those species in different depth. Key words : Radopholus similis, Pratylenchus coffeae, Arabica coffee, Robusta coffee, distribution population.