Dynamics of Tungro disease and its vector population on intercropping of rice varieties
Riski Apriyani*, Ade Rosmana, Baharuddin Patandjengi

Plant Pests and Diseases Department, Faculty of Agriculture, Hasanuddin University
Jl. Perintis Kemerdekaan KM.10 Tamalanrea Makassar 90245 Indonesia

*corresponce author: riskiapriyani15[at]gmail.com

Abstract

Tungro is one of the major diseases that can reduce theyield potential of rice. The disease is caused by rice tungro baciliform virus (RTBV) and rice tungro spherical virus (RTSV), both of which can only be transmitted by green leafhoppers, Nephotettix virescens in a semi-persistent manner. The research aimed to control both the disease and the vector by using intercropping of rice varieties. The optimum of disease incidence in 11 weeks observation on the variety of Ciherang, Inpari 32, Inpari 36, and IR 64 planted in intercropping was 7.8%, 7.3%, 3,8%, and 6.3%. Whereas, the incidence on these respective variety planted in monoculture was 9.8%, 8,8%, 4.3%, and 8.5%. Then, the optimum of N. virescens population per clump on rice variety with interplanting in the same time of observation was 4.8, 2.3, 1.5, and 4, and on variety with monoculture was 6.5, 4.5, 3.3, and 4,5, respectively. Moreover, the population of insect predators tended to be higher on variety with interplanting than on rice variety with monoculture. These data indicated that rice planted with variety interplanting was related to the reduction of tungro incidence and its vector and also the increase of insect predators. Therefore, the interplanting of variety could be used as one of control method against rice pests and diseases.

Keywords: Incidence, interplanting, Nephotettix virescens, population, rice variety, tungro.

Topic: Integrated Pest and Disease Management