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Feeding, Growth and Chemical Control of Hog-plum Beetle (podontia 14-punctata)

Mousumi Khatun
Department of Entomology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Mohammad Mahir Uddin
Department of Entomology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Md. Azizul Haque
Department of Entomology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Mohammad Saidur Rhaman
Department of Seed Science and Technology, Faculty of Agriculture, Bangladesh Agricultural University, Mymensingh-2202, Bangladesh

Abstract/ Executive Summary:

Experiments were conducted to study the feeding, growth and chemical control of hog-plum beetle (Podontia 14-punctata) in the laboratory and in the field. It was found that larval leaf consumption gradually increased with the increase of age of larva. Mean leaf consumption per larva was 0.28g, 0.86g and 1.70g after 24, 72 and 144 hrs, respectively. Growth pattern of larva was depended on the rate of leaf consumption. The average body weight of larvae was increased with time and per larva was recorded as 0.06g, 0.19g and 0.45g after 24, 72 and 144 hrs of leaf consumption. Daily leaf consumption was higher in adults than larvae. Mean leaf consumption per adult was 0.24g, 0.91g and 1.87g after 24, 72 and 144 hrs, respectively. Mortality of larvae and adults against four chemical insecticides viz. Altima 40WG, Belt 24WG, Libsen 45SC and Limper 10EC were observed both in the laboratory and field. All the treatments had a significant effect on mortality percentage of larva and adult in comparison to control. The highest mortality percentage of the larva (86.67) and adult (80.00) were observed in the case of Limper 10EC at 72 hrs after spraying. However, there was no significant difference observed in efficacy among Limper 10EC, Belt 24WG and Libsen 45SC. In field, percentage of leaf protection over control after 1st spray was the highest (37.95) in Limper 10EC and the lowest (20.86) in Altima 40WG treated plants. The results of laboratory and field trials revealed that Limper 10EC might be recommended for effective control of P. 14-punctata.

Keywords: Hog-plum beetle, Insecticides, Feeding, Growth

Location: Entomology Department and Germplasm Centre, Bangladesh Agricultural University (BAU), Mymensingh

Start Date: 00-06-2014

End Date: 00-07-2015

Program Area: Pest Management

Commodity: Insecticide

Objectives:

To study the feeding behavior, larval growth and finally to develop a suitable management strategy including some new generation chemical insecticides for the hog-plum beetle.

Methodology:

Several experiments on feeding, growth and chemical control of hog-plum beetle, Podontia 14-punctata were carried out in the laboratory of Entomology Department and Germplasm Centre, Bangladesh Agricultural University (BAU), Mymensingh during June 2014 to July 2015.The laboratory experiment was carried out at normal room temperature (32 ± ⁰C) and relative humidity using completely randomized design (CRD). The field experiment was laid out in a randomized complete block design (RCBD) with 5 treatments and 3 replications. Treatments of different doses of chemical insecticides were T1 =Altima plus (Emamectin benzoate + Thiomethaoxam) 40WG @ 0.02%, T2 = Belt (Flubendiamide) 24 WG @ 0.04 %, T3 = Limper (Cypermethrin) 10EC @ 0.1%, T4 = Libsen (Spinosad) 45SC @ 0.1%, T5 = control. These treatments were used both in laboratory and field condition. Each treatment was replicated 3 times. Leaf consumption by larva and adult: The leaf consumption of larvae and adult of P. 14-punctata was measured in terms of consumed leaf weight (g). In the case of larvae, eight Petri dishes were used to determine leaf consumption. Three grubs of 2nd and 3rd instars were released in each Petri dish. In the case of adult four Petri dishes were used. Five adults were released in each Petri dish. Water soaked cotton was supplied in Petri dishes to moisten the leaves in both cases. In both cases, fresh leaf was provided by replacing old one. Before replacing old one the weight of fresh leaves and old leaves were measured. Growth of larva: The growth of larvae was measured in terms of weight gained by larvae. Eight Petri dishes were used. Three larvae were supplied in each Petri dish. Fresh leaves were provided daily by replacing old leaves. The weight of larvae was measured daily by electronic balance before and after release in the Petri dish. Finally the weight (g) increase per day was calculated. Mortality of larva and adult: Three fresh leaflets were dipped into the different insecticide solutions and then single leaflet was placed into each Petri dish. Altima plus 40WG, Libsen 45SC, Belt 24WG and Limper 10EC were applied @ 0.02%, 0.1%, 0.04% and 0.1%, respectively. Each treatment was replicated in three times. In each petridish, 10 adults or 10 larvae were released. This procedure was continued up to three days and mean percentage mortality was calculated. Protocol for field trial: The hog-plum plants of BAU Germplasm Centre, Bangladesh Agricultural University, Mymensingh. For field trial, beetle infested small trees were randomly selected. Pretreatment data was recorded on the following parameters, the number of adults, the number of larvae, the number of total leaflet and number of infested leaflet per twig. Altima plus 40WG, Libsen 45SC, Belt 24WG and Limper 10EC were applied @ 0.02%, 0.1%, 0.04% and 0.1%, respectively. Appropriate doses of insecticides were prepared by adding required amount of water. Spraying was done by a hand sprayer. A total of two sprayings were given during experimental period. Spraying was done within 9.00 to 11.00 AM to avoid bright sun shine and drift caused by strong wind. Statistical analysis of data: The recorded data were compiled and tabulated for statistical analysis. Analysis of variance was done with the help of computer package MSTAT. The mean differences among the treatments were adjusted with Duncan's Multiple Range Test (DMRT) and Least Significant Difference (LSD) when necessary.

Source of Information: Res. Agric. Livest. Fish. Vol. 3, No. 3, December 2016: 387-394

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

From the results, it may be concluded that leaf consumption increased with the increase of larval age. Larval weight also increased by consumption of leaves. Adult beetle consumed more leaf than the larva and rate of leaf consumption was increased day by day. Finally, the results of the effectiveness of insecticides were almost similar. Based on the results it might be concluded that among four insecticides Limper 10EC was most effective in mortality and in reducing the extent of leaf damage. The rank of the efficacy of four chemical insecticides tested against hog-plum beetle was: Limper > Belt >Libsen> Altima.

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