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Abundance, Damage Severity and Management of Guava Mealybug, Ferrisia Virgata Ckll

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

Abstract/ Executive Summary:

The research was carried out to know the abundance and damage severity of mealybug on sarupkathi variety of guava and to evaluate the efficacy of jet powder and Fighter 2.5EC for suppressing populations of mealybug during January to October 2014. Results revealed that the highest number of guava mealybug was observed on middle leaf (42/leaf) while the lowest number was on lower leaf (13/leaf). The highest percent leaf area covered by mealybug was found on middle leaf (78%) while the lowest was on fruit (18%). Maximum temperature and relative humidity had a positive correlation on the mealybug population while the rainfall showed a negative correlation. The highest percent mortality was observed in T2 treatment (Jet powder applied @ 5.0 g L^-1 of water) at 24 HAT (hours after treatment) (86.05%) and 48 HAT (93.83%), respectively. At 72 HAT, the highest percent mortality was observed T3 treatment (Jet powder applied @ 7.5 g L^-1 of water). In case of insecticidal control, the highest percent mortality was observed in T2 (100%) and T3 (100%) treatments, respectively followed by T1 (98.03%) at 24 HAT. Similar trends were also observed among all treatments at 48 HAT and 72 HAT, respectively. No significant differences were found among three doses of Fighter 2.5EC. The lowest percent mortality of mealybug population was found in T4 (Water spray forcibly) at 24 HAT, 48 HAT and 72 HAT, respectively. No mortality was recorded in untreated control at different HAT in both application of soap solution and insecticides.

Keywords: Ferrisia virgata, Psidium guajava, Jet, Fighter 2.5EC, Meteorological factors

Location: Department of Entomology, Patuakhali Science and Technology University (PSTU)

Start Date: 00-01-2014

End Date: 00-10-2014

Program Area: Pest Management

Commodity: Insects, Guava

Objectives:

To know the abundance and damage severity of mealybug on guava and to evaluate the efficacy of detergents and insecticides for suppressing population of mealybug.

Methodology:

The study was carried out in the Department of Entomology, Patuakhali Science and Technology University (PSTU) during January to October 2014. The area lies at 0.9 to 2.1 metre above mean sea level (Iftekhar and Islam, 2004). The experimental area experiences sub-tropical climate with high temperature and it decreased when the season proceeded towards rabi (October to March). Abundance and damage severity of guava mealybug A total of 10 plants were selected as host of mealybug. The age and height of the plants were 5 years and 9 feet, respectively. Infested plants were examined using a magnifying glass. Infested leaves, twigs and fruits were collected from the plants and placed separately in poly bags for further examination in the laboratory. The collected specimens were counted, processed, mounted and labeled for preservation. Number of mealybugs per 5 leaves on different leaf categories viz upper, middle and lower, twig and fruits of each guava plant were recorded. The data were collected on weekly intervals. The percent leaf area covered by mealybugs was recorded by eye estimation. Collection of meteorological data Meteorological data on maximum and minimum temperature, relative humidity and rainfall were collected from the Patuakhali district meteorological office. Evaluation of the efficacy of detergent and insecticide for controlling mealybug The trial was conducted in completely randomized design with three replications. The infested leaves of different plant canopies were collected from highly infested guava plants and brought back to the laboratory. Thirty mealybugs of nymphs and adults were released on each leaf which was kept in Petri dish. Three doses of Jet powder were used as three treatments where T1 = 2.5 g L^-1 of water, T2 = 5.0 g L^-1 of water and T3 = 7.5 g L^-1of water along with a control. On the other hand, three doses of Fighter 2.5 EC were used as three treatments where T1 = 1.0 ml L^-1 of water, T2 = 1.5 ml L^-1 of water and T3 = 2 ml L^-1 of water along with a control. The spraying was done with hand sprayer. After spraying the treated leaves were put on soaked filter paper by keeping these in Petri dish separately. The Petri dishes were arranged in three rows following CRD. One row of Petri dishes constituted one replication and a total of 15 Petri dishes were used in this experiment. However, control leaves received no treatment. Observations were recorded on the mortality of mealybugs at 24, 48 and 72 hours interval and cumulative data were calculated for interpretation. Statistical analysis Data were analyzed following single factor ANOVA using MSTAT-C computer software. Means were separated by LSD test. The correlations were worked out between mealy bug population and weather parameters of study period.

Source of Information: SAARC J. Agri., 16(2): 73-82 (2018)

Article Link (Online Journal): DOI: https://doi.org/10.3329/sja.v16i2.40260

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The highest number of guava mealybug was observed on middle leaf of guava. Populations of mealybug increased with increasing temperature and relative humidity and decreased with increasing rainfall. Application of jet powder @ 5.0 g L^-1 of water and three doses (1.0 ml, 1.5 ml and 2.0 ml L^-1 of water) of Fighter 2.5 EC at 24, 48 and 72 HAT were found effective in controlling mealybug population in laboratory condition.

Knowledge Management: Journal