Four tobacco cultivars viz. Flue-cured Virginia (FCV), Sun-cured Rustica (SCR), Dark Air-cured (D... more Four tobacco cultivars viz. Flue-cured Virginia (FCV), Sun-cured Rustica (SCR), Dark Air-cured (DAC) and Air-cured Burley (ACB) were evaluated for preference by larvae and adults of Lasioderma serricorne. Leaf thickness (LT), moisture content (MC), nicotine, total sugars (TS), starch, chlorides and potassium contents were determined and the impact of these factors on beetle preference was worked out. FCV tobacco was highly preferred by both larvae (2.18) and adults (1.49) due to high percentages of MC (12.50), TS (15.84) and starch (6.89). ACB was least preferred due to low contents of MC (11.40%), TS (1.29%) and starch (1.14%). Potassium had negatively significant effect on the beetle’s preference. Regression analyses revealed a positive relationship of larvae and adults with MC (0.780, 0.803) TS (0.866, 0.713) and starch (0.888, 0.765) while a negative relationship with potassium (-0.684, -0.407). LT (0.155, 0.101) nicotine (-0.047, -0.277) and chlorides (0.163, 0.305) had non-significant association with preference by both larvae and adults respectively. The relationship between MC, TS and starch is direct curvilinear as their increase had encouraged the population of L. serricorne.
Various concentrations (100, 500, 1000, 5000 and 10000 ppm) of boric acid were tested in
laborato... more Various concentrations (100, 500, 1000, 5000 and 10000 ppm) of boric acid were tested in laboratory to check its potential as a slow-acting toxicant against subterranean termite, Heterotermes indicola (Rhinotermitidae: Isoptera). Under the tested concentrations, ELT 50 (Effective Lethal Dose to kill 50% of the exposed termites) values ranged from 2.7 to 5.4 days while ELT 90 were 4.5 and 9.1 days for the lowest and highest concentrations used in the lab trial. Choice feeding test showed that bait matrix treated with all the above concentrations was acceptable to termites. At a concentration of 10000 ppm, boric acid resulted in 91% mortality within two weeks when both the treated and untreated substrates were offered to H. indicola. Field testing of boric acid bait showed that it was readily fed upon by Odontotermes sp. while H. indicola avoided the bait after initial feeding exposure. However, it led to significant population suppression for both the genera of subterranean termites.
Extract of five indigenous plants viz. Mentha longifolia (Mint), Momordica charantia (Bitter Gour... more Extract of five indigenous plants viz. Mentha longifolia (Mint), Momordica charantia (Bitter Gourd), Luffa aegyptiaca (Sponge Gourd), Carum copticum (Ajwain) and Curcuma longa (Turmeric) were tested at different concentrations of 25, 50 and 75% to check their repellency effect against Rhyzopertha dominica during 10 days of exposure. Complete repellency was exhibited by Mentha longifolia followed by Momordica charantia (90%), Luffa aegyptiaca (80%), Carum copticum (76.67%) and Curcuma longa (66.67%) at 75% dose rate. Thus, it can be inferred that the natural plant extracts can prove the best alternatives to chemical repellents.
Four tobacco cultivars viz. Flue-cured Virginia (FCV), Sun-cured Rustica (SCR), Dark Air-cured (D... more Four tobacco cultivars viz. Flue-cured Virginia (FCV), Sun-cured Rustica (SCR), Dark Air-cured (DAC) and Air-cured Burley (ACB) were evaluated for preference by larvae and adults of Lasioderma serricorne. Leaf thickness (LT), moisture content (MC), nicotine, total sugars (TS), starch, chlorides and potassium contents were determined and the impact of these factors on beetle preference was worked out. FCV tobacco was highly preferred by both larvae (2.18) and adults (1.49) due to high percentages of MC (12.50), TS (15.84) and starch (6.89). ACB was least preferred due to low contents of MC (11.40%), TS (1.29%) and starch (1.14%). Potassium had negatively significant effect on the beetle’s preference. Regression analyses revealed a positive relationship of larvae and adults with MC (0.780, 0.803) TS (0.866, 0.713) and starch (0.888, 0.765) while a negative relationship with potassium (-0.684, -0.407). LT (0.155, 0.101) nicotine (-0.047, -0.277) and chlorides (0.163, 0.305) had non-significant association with preference by both larvae and adults respectively. The relationship between MC, TS and starch is direct curvilinear as their increase had encouraged the population of L. serricorne.
Various concentrations (100, 500, 1000, 5000 and 10000 ppm) of boric acid were tested in
laborato... more Various concentrations (100, 500, 1000, 5000 and 10000 ppm) of boric acid were tested in laboratory to check its potential as a slow-acting toxicant against subterranean termite, Heterotermes indicola (Rhinotermitidae: Isoptera). Under the tested concentrations, ELT 50 (Effective Lethal Dose to kill 50% of the exposed termites) values ranged from 2.7 to 5.4 days while ELT 90 were 4.5 and 9.1 days for the lowest and highest concentrations used in the lab trial. Choice feeding test showed that bait matrix treated with all the above concentrations was acceptable to termites. At a concentration of 10000 ppm, boric acid resulted in 91% mortality within two weeks when both the treated and untreated substrates were offered to H. indicola. Field testing of boric acid bait showed that it was readily fed upon by Odontotermes sp. while H. indicola avoided the bait after initial feeding exposure. However, it led to significant population suppression for both the genera of subterranean termites.
Extract of five indigenous plants viz. Mentha longifolia (Mint), Momordica charantia (Bitter Gour... more Extract of five indigenous plants viz. Mentha longifolia (Mint), Momordica charantia (Bitter Gourd), Luffa aegyptiaca (Sponge Gourd), Carum copticum (Ajwain) and Curcuma longa (Turmeric) were tested at different concentrations of 25, 50 and 75% to check their repellency effect against Rhyzopertha dominica during 10 days of exposure. Complete repellency was exhibited by Mentha longifolia followed by Momordica charantia (90%), Luffa aegyptiaca (80%), Carum copticum (76.67%) and Curcuma longa (66.67%) at 75% dose rate. Thus, it can be inferred that the natural plant extracts can prove the best alternatives to chemical repellents.
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and Air-cured Burley (ACB) were evaluated for preference by larvae and adults of Lasioderma
serricorne. Leaf thickness (LT), moisture content (MC), nicotine, total sugars (TS), starch, chlorides and
potassium contents were determined and the impact of these factors on beetle preference was worked out.
FCV tobacco was highly preferred by both larvae (2.18) and adults (1.49) due to high percentages of MC
(12.50), TS (15.84) and starch (6.89). ACB was least preferred due to low contents of MC (11.40%), TS
(1.29%) and starch (1.14%). Potassium had negatively significant effect on the beetle’s preference.
Regression analyses revealed a positive relationship of larvae and adults with MC (0.780, 0.803) TS
(0.866, 0.713) and starch (0.888, 0.765) while a negative relationship with potassium (-0.684, -0.407). LT
(0.155, 0.101) nicotine (-0.047, -0.277) and chlorides (0.163, 0.305) had non-significant association with
preference by both larvae and adults respectively. The relationship between MC, TS and starch is direct
curvilinear as their increase had encouraged the population of L. serricorne.
laboratory to check its potential as a slow-acting toxicant against subterranean termite,
Heterotermes indicola (Rhinotermitidae: Isoptera). Under the tested concentrations, ELT 50
(Effective Lethal Dose to kill 50% of the exposed termites) values ranged from 2.7 to 5.4 days
while ELT 90 were 4.5 and 9.1 days for the lowest and highest concentrations used in the lab
trial. Choice feeding test showed that bait matrix treated with all the above concentrations was
acceptable to termites. At a concentration of 10000 ppm, boric acid resulted in 91% mortality
within two weeks when both the treated and untreated substrates were offered to H. indicola.
Field testing of boric acid bait showed that it was readily fed upon by Odontotermes sp. while
H. indicola avoided the bait after initial feeding exposure. However, it led to significant
population suppression for both the genera of subterranean termites.
Luffa aegyptiaca (Sponge Gourd), Carum copticum (Ajwain) and Curcuma longa (Turmeric) were tested
at different concentrations of 25, 50 and 75% to check their repellency effect against Rhyzopertha
dominica during 10 days of exposure. Complete repellency was exhibited by Mentha longifolia followed
by Momordica charantia (90%), Luffa aegyptiaca (80%), Carum copticum (76.67%) and Curcuma longa
(66.67%) at 75% dose rate. Thus, it can be inferred that the natural plant extracts can prove the best
alternatives to chemical repellents.
and Air-cured Burley (ACB) were evaluated for preference by larvae and adults of Lasioderma
serricorne. Leaf thickness (LT), moisture content (MC), nicotine, total sugars (TS), starch, chlorides and
potassium contents were determined and the impact of these factors on beetle preference was worked out.
FCV tobacco was highly preferred by both larvae (2.18) and adults (1.49) due to high percentages of MC
(12.50), TS (15.84) and starch (6.89). ACB was least preferred due to low contents of MC (11.40%), TS
(1.29%) and starch (1.14%). Potassium had negatively significant effect on the beetle’s preference.
Regression analyses revealed a positive relationship of larvae and adults with MC (0.780, 0.803) TS
(0.866, 0.713) and starch (0.888, 0.765) while a negative relationship with potassium (-0.684, -0.407). LT
(0.155, 0.101) nicotine (-0.047, -0.277) and chlorides (0.163, 0.305) had non-significant association with
preference by both larvae and adults respectively. The relationship between MC, TS and starch is direct
curvilinear as their increase had encouraged the population of L. serricorne.
laboratory to check its potential as a slow-acting toxicant against subterranean termite,
Heterotermes indicola (Rhinotermitidae: Isoptera). Under the tested concentrations, ELT 50
(Effective Lethal Dose to kill 50% of the exposed termites) values ranged from 2.7 to 5.4 days
while ELT 90 were 4.5 and 9.1 days for the lowest and highest concentrations used in the lab
trial. Choice feeding test showed that bait matrix treated with all the above concentrations was
acceptable to termites. At a concentration of 10000 ppm, boric acid resulted in 91% mortality
within two weeks when both the treated and untreated substrates were offered to H. indicola.
Field testing of boric acid bait showed that it was readily fed upon by Odontotermes sp. while
H. indicola avoided the bait after initial feeding exposure. However, it led to significant
population suppression for both the genera of subterranean termites.
Luffa aegyptiaca (Sponge Gourd), Carum copticum (Ajwain) and Curcuma longa (Turmeric) were tested
at different concentrations of 25, 50 and 75% to check their repellency effect against Rhyzopertha
dominica during 10 days of exposure. Complete repellency was exhibited by Mentha longifolia followed
by Momordica charantia (90%), Luffa aegyptiaca (80%), Carum copticum (76.67%) and Curcuma longa
(66.67%) at 75% dose rate. Thus, it can be inferred that the natural plant extracts can prove the best
alternatives to chemical repellents.