KEPEKAAN LARVA KUMBANG PREDATOR WERENG COKLAT (Menochilus sexmaculatus) TERHADAP Cordyceps militaris = THE SENSITIVITY OF BROWN PLANTHOPPER PREDATORY BEETLE (Menochilus sexmaculatus) TO Cordyceps militaris

RIZKIANI, SRI HIKMAH and Herlinda, Siti (2018) KEPEKAAN LARVA KUMBANG PREDATOR WERENG COKLAT (Menochilus sexmaculatus) TERHADAP Cordyceps militaris = THE SENSITIVITY OF BROWN PLANTHOPPER PREDATORY BEETLE (Menochilus sexmaculatus) TO Cordyceps militaris. Undergraduate thesis, Sriwijaya University.

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Abstract

Nilaparvata lugens is an important pest of rice with infestation area might reach 20.000 ha/year. To control N. lugens we can use entomopathogeic fungi, which may cause mortality of the insect up to 97.5%. One of the entomopathogenic fungi that has been frequently used to control N. lugens is Cordyceps militaris. The application of the fungi in the field might affect predator life. Therefore, this research was aimed at studying the sensitivity of Menochilus sexmaculatus larvae to six concentrations of Cordyceps militaris. The experiment was arranged in Completely Randomized Block design (CRBD) using C. militaris conidial concentration of 1x104 spores.mL-1, 1x105 spores.mL-1, 1x106 spores.mL-1, 1x107 spores.mL-1, 1x108 spores.mL-1, and 1x109 spores.mL-1 and was replicated three times. Liquid media of the entomopathogenic fungi was incubated in room temperature for 15 days before being counted their spore density to make the intended spore concentration. The insects treated were 25 M. sexmaculatus of the first instar for each replicate The data collected was analysed using ANOVA. The daily lethal time was recorded to determined LT50, LT90, LC50, using LC90 probit analyses. The results showed that mortality of M. sexmaculatus larvae was significantly different at day-4 to day-9. The lowest mortality was of day-3 and the highest was of day-9. Analyses result showed that the shortest LT50 was resulted by treatment 1x109 spores.mL-1,amounted to 5.10 days, while the longest LT50 was resulted by treatment 1x104 spores.mL-1, amounted to 7.78 days. The analyses results also showed that the shortest LT90 was resulted by treatment 1x109 spores.mL-1, amounted to 7.49 days, while the longest LT90 was resulted by treatment 1x104 spores/mL, amounted to 12.18 days. The results also showed that the concentration of C. militaris able to kill dapat 50% of treated insect was 1.3x106 spores.mL-1 and the average concentration of C. militaris able to kill 90% of treated insect was 0.6x107 spores.mL-1. The concentration of C. militaris gave bad impact to predatory insect. The application of C. militaris also affected the number of N. lugens preyed by larvaea of M. Sexmaculatus. The number of brown plant hopper nymphs preyed by the predator at day-1 and day-2 was significantly different from that of control. While those of day -7, day-8 and day-9 were significantly different among treatments. Larvae treated with spore concentration of 1x104 spores.mL-1 preyed more plant hopper than those of other concentration. Larvae infected by C. militaris showed the following symptoms, at day-1 they start to less moving, slightly less feeding, normal color; at day-2 less moving, less feeding, normal color; day-3 less a moving, less feeding, slightly pale color; day-4 less moving, less feeding, pale color; day-5, less activity, less feeding, pale color; day-6, nearly stop moving, less feeding, blackish color; day-7, stop moving, less feeding, black color and slivered, day-8, start moving up to bottle top, less feeding, black color and shriveled; day- 9, stop moving and hanging on plant surface and bottle wall, stop feeding, black color and shriveled; day-10, no motion and hanging on plant and bottle wall, stop feeding, black colour, shrivelled and start mummifying. Larval mortality started at day-2 and increased until day-10. Based on this research, it can be concluded that amongst 6 concentrations of C. militaris which induced mortality of M. sexmaculatus was 1x104 spores.mL-1.

Item Type:	Thesis (Undergraduate)
Uncontrolled Keywords:	Cordyceps militaris, Menochilus sexmaculatus
Subjects:	S Agriculture > SB Plant culture > SB610-615 Weeds, parasitic plants, etc. treatment of diseases. Plant protection
Divisions:	05-Faculty of Agriculture > 54211-Agricultural Technology (S1)
Depositing User:	Users 12 not found.
Date Deposited:	28 Aug 2019 03:47
Last Modified:	28 Aug 2019 03:47
URI:	http://repository.unsri.ac.id/id/eprint/4969

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