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Varietal Preference of Some Major Pests on Rice Mutants and Their Interaction with Natural Enemies

MD. ANUZ PARVEZ
MASTER OF SCIENCE (MS) IN ENTOMOLOGY, DEPARTMENT OF ENTOMOLOGY, BANGLADESH AGRICULTURAL UNIVERSITY, MYMENSINGHExamination Roll No.Ag.Entom.JJ-09M/05, Registration No. 26476, Session: 1998-99, Semester: January-June,2006

Abstract/ Executive Summary:

Field and laboratory experiments were conducted to determine the susceptibility of eight mutant/varieties of rice to different insect pests during the period from January 2005 to June 2005 in Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh. The mutant/varieties tested were TNDB-100, RM-250-133, PNR-381. Y-1281, RD-2586, R-3027, TKM-6 and TNI. The varieties were evaluated against Green leafhopper (N. nigropictus and N. virescens), white backed plant hopper, Grasshopper, white leafhopper, Stem borer. Orange headed leafllopper and Zigzag leafllopper. Populations of five predatory insects namely. Ladybird beetle, Damsel fly, Ground beetle, Mirid bug and one spider species found on these varieties were also recorded. Population of GLH, WLII, WBPII, OHLH, ZZLH, GH and natural enemies were studied by sweeping the plots. The data on stem borer damage was recorded at 45 DAT and at I0 days before harvest. Reaction of mutant/varieties against BPH were tested by feeding response studies and change of weight after feeding on these mutants/varieties for 24 hours. Among the eight rice mutant/varieties TNI, RM-250-133, TNDB-100 and PNR-381 were most susceptible to green leafllopper, white backed plant hopper, white leafhopper and grasshopper. The population of GLH (N. nigropictus) was lowest at 4 weeks that gradually increased reaching the highest number at 7 weeks after transplanting. The population of GLH (N. virescens) increased gradually up to 6 weeks and than declined at 7 weeks. The population of Grasshopper also followed the same trends. The populations of WLH and OHLH were more or less same throughout the growing period. Statistically significant difference was also observed on the number of natural enemies at different ages on rice plant. The mutant/varieties TNI, TNDB-100, PNR-381 and RD-2586 were found susceptible to Stem borer, whereas Y-1281 were moderately susceptible and RM-250-133, TKM-6 were resistant to Stem borer. On the basis of feeding response studies the varieties TNDB-100 and R-3027 were found to be resistant to brown planthopper.

Keywords: Varietal performance, Major pests, Rice, Natural enemies

Location: Bangladesh Institute of Nuclear Agriculture (BINA), Mymensingh

Start Date: 00-01-2005

End Date: 00-06-2005

Program Area: Pest Management

Commodity: Rice

Objectives:

1. To find out the resistance of several rice mutant/varieties against some major pests of rice (green leafhopper, white backed planthopper, white leafhopper, grasshopper. zigzag leafhopper, orange headed leafhopper, stem borer and brown planthopper), 2. To find out the incidence of some natural enemies on different mutant/variety and there interaction with rice pest, and 3. To find out the abundance of insect pest at different ages of rice plant.

Methodology:

Experiment were conducted in the field and laboratory as well as in the growth room of Entomology Division. Bangladesh Institute of Nuclear Agriculture (BINA), Mmensingh during the period from January 2005 to June 2005 to determine the susceptibility of eight rice varieties/mutants viz. TNDB-100, TKM-6, R-3027, Y-1281. RD2586, TNI, RM250-133 and PNR-381 to various insect pests. The major insect pests of rice and their natural neem (pircesdators and parasites) were collected in two way viz. by sweeping nets and by collecting the infested tillers. Population of green leafhopper. white backed planthopper, white leafhopper, grasshopper, zigzag leafhopper, orange-headed leafhopper, lady bird beetle, mirid bug, damsel fly. spider and ground beetle were collected by sweeping. In case of sweeping. ten complete sweeps were made per plot diagonally to collect the adult, nymphs and larvae of insect and predators. Collected specimens were identified and counted. The number of collected insect pests and their natural enemies were recorded.The statistical package used for analysis was M-stat program. The analysis of variance (ANOVA) of the result on various insect pests and natural enemies was calculated. The significant means were compared by Duncan's Multiple Range Test at I% level and 5% level.

Source of Information: MASTER OF SCIENCE (MS) IN ENTOMOLOGY, DEPARTMENT OF ENTOMOLOGY, BANGLADESH AGRICULTURAL UNIVERSITY, MYMENSINGH Examination Roll No.Ag.Entom.JJ-09M/05, Registration No. 26476, Session: 1998-99, Semester: January-June,2006

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Among the eight rice mutant/varieties TNI, RM-250-133, TNDB-100 and PNR-381 were most susceptible to green leafllopper, white backed plant hopper, white leafhopper and grasshopper. The population of GLH (N. nigropictus) was lowest at 4 weeks that gradually increased reaching the highest number at 7 weeks after transplanting. The population of GLH (N. virescens) increased gradually up to 6 weeks and than declined at 7 weeks. The population of Grasshopper also followed the same trends. The populations of WLH and OHLH were more or less same throughout the growing period. Statistically significant difference was also observed on the number of natural enemies at different ages on rice plant. The mutant/varieties TNI, TNDB-100, PNR-381 and RD-2586 were found susceptible to Stem borer, whereas Y-1281 were moderately susceptible and RM-250-133, TKM-6 were resistant to Stem borer. On the basis of feeding response studies the varieties TNDB-100 and R-3027 were found to be resistant to brown planthopper.

Knowledge Management: Thesis