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Effects of Insecticides for Controlling Hogplum Beetle Podontia 14-punctata Under Laboratory and Field Conditions

M. J. Uddin
Territory officer, Bayer Crop Science Limited, Noapara, Jessore

M. M. H. Khan
Department of Entomology,Patuakhali Science and Technology University, Dumki, Patuakhali-8602

Abstract/ Executive Summary:

Experiments on hogplum beetle, Podontia 14-punctata were carried out to find out the suitable insecticide(s) with appropriate dose(s) for suppressing both larvae and adults. Results revealed that the highest mortality (100%) was found in 1st instar larvae after 24 hours at each dose of superior 505EC and the lowest mortality was in T4 treated leaves. The highest mortality was also found in 2nd, 3rd, 4th and adult stages of hog-plum beetle by T5 and T6 treatments. No mortality was observed in control treatment in laboratory trial. The mean number of larvae ranged from 1.5 to 7.6 per square meter of quadrate at one week after last spray. No significant difference was observed among treatments regarding percent leaf infestation at one day before 1st spray. The percent leaf infestation ranged from 5.01 to 9.82 at one week after last spray. The lowest percent (5.87%) leaf infestation was found in T6 treated plants while the highest percent (15.76%) leaf infestation was found in untreated control plants. The highest mortality was observed in T5 and T6 treated plants at all larval instars and no significant difference was found between two doses of each insecticide under field condition. The results of field trial also revealed that the minimum dose (0.75 ml L-1 of water) of Superior 505 EC is sufficient to suppress the field population of larvae and adults of Podontia 14-punctata effectively. Finally, it may be concluded that the highest mortality was found in all larval instars and adult stage of hog-plum beetle after 24 hours at each dose of superior 505 EC (T5 and T6 treatments) both in laboratory and field trials.

Keywords: Hogplum beetle, Insecticide

Location: Patuakhali Science and Technology University (PSTU), Dumki, Patuakhali and The hog-plum orchard of Regional Agricultural Research Station (RARS), BARI, Rahmatpur, Barisal, Bangladesh.

Start Date: 01-08-2012

End Date: 30-09-2012

Program Area: Pest Management

Commodity: Hogplum

Objectives:

To find out the most suitable insecticide(s) with appropriate dose(s) against larvae and adults of hogplum beetle.

Methodology:

The laboratory experiment was carried out under normal room temperature (32 ± 0C) and relative humidity (85 ± 5%) with a 14 ± 2:10±2 light and dark cycle (L:D) following completely randomized design (CRD). The field experiment was laid out in a randomized complete block design (RCBD) with 7 treatments and 3 replications. Treatments of different doses of chemical insecticides were T₁ = Chita (Chlorpyrifos) 48EC @ 0.75 ml L^-1 of water, T₂ = Chita (Chlorpyrifos) 48 EC @ 1.0 ml L^-1 of water, T₃ = Fighter (Lambdacyhalothrin) 2.5EC @ 0.75 ml L^-1 of water, T₄ = Fighter (Lambdacyhalothrin) 25 EC @ 1.0 ml L^-1 of water, T₅ = Superior (Chlorpyripos+ Cypermrthrin) 505 EC @ 0.75 ml L-1 of water, T₆ = Superior (Chlorpyripos + Cypermrthrin) 505 EC @ 1.0 ml L^-1 of water and T₇ = Untreated control. These treatments were used both in laboratory and field condition. Each treatment was replicated 3 times. In laboratory trial Before applying insecticidal solution, the petiole of fresh succulent mid aged hog-plum leaflet was placed inside the plastic pot. Then 10 larvae or 10 adult beetles were released in each plastic pot. When the released larvae or adult beetles started normal movement then the insecticidal treatments were applied by a hand sprayer as cover spray. After treating the leaflet, the mouth of the plastic pot was covered with mosquito net. After application of the treatments, the covered pots were placed on the laboratory table near opened window. Mortality data of 1st, 2nd, 3rd 4th instar larvae and adult were noted at 24 hours after treatment. In field trial A total of 21 trees of around 6 years old were used for this study. One hogplum tree was considered as one treatment replication. Plant to plant distance was 20 ft × 20 ft. The evaluated treatments were T₁ = Chita (Chlorpyrifos) 48EC @ 0.75 ml L^-1 of water, T₂ = Chita (Chlorpyrifos) 48EC @ 1.0 ml L^-1 of water, T₃ = Fighter (lambdacyhalothrin) 2.5EC @ 0.75 ml L^-1 of water, T₄ = Fighter (lambdacyhalothrin) 25 EC @ 1.0 ml L^-1 of water, T₅ = Superior (Chlorpyripos+Cypermrthrin) 505 EC @ 0.75 ml L^-1 of water, T₆ = Superior (Chlorpyripos+Cypermrthrin) 505 EC @ 1.0 ml L^-1 of water and T₇ = Untreated control. Design of the trial was laid out in RCBD with three replications. A total of three sprays were made at 10 days intervals. Each spray was done by manually driven foot pump sprayer as a full cover spray for the hog-plum tree. The leaves, branches and the main trunk of each tree were sprayed with spray mixture through the outlet of the nozzle. Application was made in such a way that the spray pressure would not knock down the pest from the tree. The pre treatment data were recorded on the number of 1st, 2nd, 3rd and 4th instars larvae and adults. Field mortality data on 1st, 2nd, 3rd 4th instar larvae and adult were recorded at 24 hours after treatment. One square meter (1 m2) quadrat was placed in the central position of the east side canopy structure. The number of adults and larvae was also counted from inside each quadrat under different treatments at one day before the first spray and 1 week after the last spray. The number of healthy and infested leaves was counted from inside each quadrat under different treatments at one day before the first spray and one week after the last spray. Statistical analysis Single factor analysis of variance (ANOVA) on different parameters was done following completely randomized design (CRD) in laboratory trials and randomized complete block design (RCBD) in field trial. Data transformations were done wherever required. Multiple comparisons of parameter (where required) among different treatments were evaluated based on LSD test.

Source of Information: J. Environ. Sci. & Natural Resources, 8(1): 79-83, 2015; ISSN 1999-7361

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

From the results of laboratory and field trial it may be concluded that the lower dose (0.75 ml L^-1 of water) of Superior 505 EC may be recommended for effective suppression of hogplum beetle instead of presently studied higher dose (1.0 ml L^-1 of water) of Superior 505 EC.

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