Insecticide bio as 3 ays were carried out on JD. thoracica
(a) adults by topical application of 1 pi drop of toxicant on their
nota; and Ob) eggs by dipping them into insecticidal solutions for
30 min. LC50 values obtained from the tests on the adults were:
Gamma BHC, 26.4Ctog/l; Pirimiphos methyl (PP511) 28.00 mg/l; Serin,
67.00 mg/l and Malathion, 580.00 mg/l. Values obtained from the
eggs tests were: PP511, 1.30 mg/l; Sevin, 5.30 mg/l; gamma BHC,
18.30 mg/l andMalathion, 83.00 mg/l.
A field trial ms carried out to assess the efficacies of PP51
gamma BHC, Sevin, Basudin (Diazinon) and Bidrin in controlling
Biopsid borer infestation in a rice farm on the Accra Plains. Spra;
applications were made of 0 .04$ active ingredient solutions of the
insecticides at 5, 8, and 11 weeks after transplanting rice variety
All the insecticides r e du c ed the- h o rer infestation compared to
the control plots at the pre-heading stage of the rice plants. Gant
M C and Bidrin treatments reduced the borer infestation more than tl:
ofcha:insecticides after the second spray application. Stem borer
infestation during the fading period was low in all the experiment
plots and yields from the treated plots were not different from the
control. Borer-induced tillering in the rice may have compensated
for the effect of borer infestation on yield.
The rate of penetration of 14C-PP511 into the abdominal
cuticle of B. thoracica adult f©sales was determined by topical
application of 0.01 jiCi (0.693 pgr) of the insecticide in
cyclohexane solvent . The maximum rate of penetration, 3 »1$/min
(l86$/h) oecured 1 1 ,5 min after application when 28^ of the
applied dose had penetrated the insect’s cuticle. Toxic effects
of the insecticide became evident about 60 min after application
and became acute thereafter.
hagan, G (2021). Some Insecticide Studies On The Rice Stem Borer. Afribary. Retrieved from https://afribary.com/works/some-insecticide-studies-on-the-rice-stem-borer
Hagan, George "Some Insecticide Studies On The Rice Stem Borer" Afribary. Afribary, 09 Apr. 2021, https://afribary.com/works/some-insecticide-studies-on-the-rice-stem-borer. Accessed 21 Mar. 2023.
Hagan, George . "Some Insecticide Studies On The Rice Stem Borer". Afribary, Afribary, 09 Apr. 2021. Web. 21 Mar. 2023. < https://afribary.com/works/some-insecticide-studies-on-the-rice-stem-borer >.
Hagan, George . "Some Insecticide Studies On The Rice Stem Borer" Afribary (2021). Accessed March 21, 2023. https://afribary.com/works/some-insecticide-studies-on-the-rice-stem-borer