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Management Techniques for Suppressing Hogplum Beetle by Using Some Chemicals and Cultural Approach

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

Abstract/ Executive Summary:

Experiment on hogplum beetle, Podontia 14-punctata, was carried out to find out the suitable technique(s) for suppressing both larvae and adults of hogplum beetle. Results revealed in field trial that the highest mortality (98.56%) was found in all larval instars and adult stages of hogplum beetle after 24 hours by the effect of spading + Superior 505 EC (Chlorpyriphos + Cypermethrin) @ 10 ml/10 liter of water (T₂) and lowest mortality was recorded in T₃(83.85%) treated leaves. The highest infestation reduction over control was obtained from T6 (62.75%) treated plant compared to other treated plants. In laboratory trial, the highest mortality (96.62%) was found in all larval instars and adult stages of hogplum beetle after 24 hours by the treatment of superior 505EC (T₂) followed by T₄ (88.00%) and lowest mortality was in T₃ (69.70%) treated leaves. No mortality was observed in control treatment (T₅).

Keywords: Hogplum, Management technique, Chemical, superior 505 EC.

Location: Entomology Department of Patuakhali Science and Technology University (PSTU), Dumki, Patuakhali as well as at the hogplum orchard of Regional Agricultural Research Station (RARS), BARI, Rahmatpur, Barisal,

Start Date: 00-04-2013

End Date: 00-10-2013

Program Area: Pest Management

Commodity: Insects

Objectives:

To develop management technique(s) for suppressing hogplum beetle by using some chemicals and cultural approach at hogplum orchards or farmer’s homestead garden of Patuakhali and Barisal districts.

Methodology:

Experiment on hogplum beetle, Podontia 14-punctata was carried out in the laboratory of Entomology Department of Patuakhali Science and Technology University (PSTU), Dumki, Patuakhali as well as at the hogplum orchard of Regional Agricultural Research Station (RARS), BARI, Rahmatpur, Barisal, Bangladesh, during April to October, 2013. The laboratory experiment was carried out under normal room temperature (32⁰C) 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 5 treatments and 3 replications. A total of 15 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 = Spading + Chita 48 EC (Chlorpyriphos) @ 10 ml/10 liter of water, T₂ = Spading + Superior 505 EC (Chlorpyriphos + Cypermethrin) @ 10 ml/10 liter of water, T₃= Spading + Seatap 50 SP @ 15g/ 10 liter of water, T₄= Spading + Hitfen 20 EC @ 10 ml/10 liter of water and T₅ = 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 hogplum 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. Before applying insecticidal solution, the petiole of fresh succulent mid aged hogplum 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 viz., T₁ = Chita 48 EC (Chlorpyriphos) @ 10 ml/10 liter of water, T₂ = Superior 505 EC (Chlorpyriphos + Cypermethrin) @ 10 ml/10 liter of water, T₃ = Seatap 50 SP @ 15 g/10 liter of water, T₄= Hitfen 20 EC @ 10 ml/10 liter of water and T₅= Untreated control were applied by a hand sprayer as cover spray. Each treatment was replicated 3 times. 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. Statistical analysis: Single factor analysis of variance (ANOVA) on different parameters was made following completely randomized design in laboratory trials and randomized complete block design in field trial. Data transformations were done wherever required. Means were compared by LSD test.

Source of Information: Bangladesh J. Zool. 44(2): 237-244, 2016 ISSN: 0304-9027 (print) 2408-8455 (online)

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Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the findings of this study it can be concluded that all treatments showed more or less similar toxic effects on the larvae and adult beetles of hogplum beetle. Superior 505EC (Chlorpyriphos + Cypermethrin) @ 10 ml/10 liter of water may be recommended for effective management of hogplum beetle in field and laboratory. Spading + Superior 505 EC (Chlorpyriphos + Cypermethrin) @ 10 ml/10 liter of water could be used as an effective technique for suppressing hogplum beetle in field condition.

Knowledge Management: Journal