New Horizons in Insect Science Towards Sustainable Pest Management

269

Antixenosis and Antibiosis Component

of Rice Resistance to Asian Rice Gall

Midge, Orseolia oryzae (Wood-Mason)

Vijay Kumar Lingaraj, A. K. Chakravarthy and Siddanagowda

Ujjanagowda Patil

A. K. Chakravarthy (ed.), New Horizons in Insect Science: Towards Sustainable Pest Management,
DOI 10.1007/978-81-322-2089-3_24, © Springer India 2015

V. K. Lingaraj () · A. K. Chakravarthy · S. U. Patil

Department of Agricultural Entomology, College of

Agriculture, UAS (B), Visveswarayya Canal Farm,

Mandya, Karnataka 571405, India

e-mail: [email protected]

Abstract

Antixenosis and antibiosis component of resistance to Asian rice gall

midge, Orseolia oryzae was investigated in 23 selected rice genotypes

under greenhouse conditions in a free-choice test. The higher number of

adults was found settled on TN1 and Jaya (0.35 and 0.32 adults/plant) com-

pared to resistant genotypes. However, the resistant genotypes, viz., RP

4647-1073, MTU 1075, and RP 4644-1183 were also recorded higher num-

ber of adults per plant 6 h after adult release besides showing resistance. So

no distinct antixenosis in terms of numbers of adults settled was evident

between resistant and susceptible genotypes. But significantly higher num-

ber of eggs were recorded on susceptible genotypes TN1 (14.44 eggs/plant)

and Jaya (13.10 egg/plant) compared to resistant. Nevertheless, these dif-

ferences could not be linked to resistance against gall midge, in view of the

short adult life span of one day and total inactivity of adults during the day

time. It is not surprising if antixenosis component is not clearly expressed

in case of rice gall midge. Similarly, the maggots survived on all the resis-

tant genotypes remained in the first instar while in susceptible genotypes

they reached second instar at 7 days, third instar at 14 days, and pupal

stage at 18 days after adult release. However, in resistant genotypes despite

supporting the maggot development up to second instar caused mortality

without manifestation of silver shoot. In this study, genotypes such as NDR

2063, JGL 11459, and JGL 13376, despite recording comparable propor-

tion of eggs to the susceptible TN1 and Jaya, continued to be resistant.

Keywords

Asian rice gall midge · Resistance · Antixenosis · Antibiosis · Rice genotypes