http://localhost:8080/handle/123456789/2768 2026-04-18T21:05:20Z http://localhost:8080/handle/123456789/1531 LIFE CYCLE OF LADYBIRD BEETLE (Rodolia sp.) AND ITS PREDATION EFFICIENCY ON MANGO MEALYBUG ( Drosicha mangiferae) BHUIYAN, MST. AFRIN AKTER The life cycle and predation efficiency of ladybird beetle(Rodolia sp.) on mango mealybug (Drosicamangiferae ) were studied under the central laboratory of the Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka, during December, 2015 to March 2016. Initially the eggs were deep yellow to pale red in color. The average length and breadth of the eggs were 1.21±0.07 mm and 0.67±0.09 mm, respectively. The eggs hatched within 12 to 14 days with an average of 12.90±0.57 days. The larvae were soft bodied, reddish in color, elongate and passed through four larval instars in three moults. The duration of larval period was 64.00±19.80 days. The 1st, 2nd, 3rd and 4th larval instars lasted for 8, 17, 22 and 31 days, respectively. The final instar larvae attained a greater size and become more strong and stout. Their body sizes was9.55±0.39 mm in length and 3.02±0.05 mm in breadth. The duration of the 4th instar larvae varied from 17 days to 31 days. The duration of pre-pupal and pupal stage varied from 2 to 5 days and 3 to 8 days respectively. The total duration from egg to adult was completed within 67 to 105 days. The adult beetle was initially orange in color but finally it gained red color. The size ranged from 7.00 mm to 8.40 mm in length and 5.00 mm to 5.50 mm in breadth. Ladybird beetle fed on mango mealybug. But their rate of feeding varied. They feed in both day and night but mainly in day time. The feeding rates increased gradually from the 1st instar to 2nd instar but decreased sharply in the 3rd instar and in the adult stage as well. One 1st instar larva of ladybird beetle consumed 0.63±0.13 1st instar nymph per day. Second instar larva of ladybird beetle fed 0.92±0.27 nymph of 2nd instar per day. The average consumption of 3rd instar ladybird beetle larva was 0.52±0.05 nymph of 3rd instar per day and an adult ladybird beetle fed 0.13±0.08 adult mango mealybug per day. A Thesis Submitted to the Department of Entomology, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN ENTOMOLOGY SEMESTER: JULY-DECEMBER, 2015 2015-11-01T00:00:00Z http://localhost:8080/handle/123456789/1530 INCIDENCE OF INSECT PESTS COMPLEX OF BARI MOTOR -1 (PISUM SATIVUM) AND THEIR MANAGEMENT ISLAM, MOHAMMAD SAIFUL The experiment was conducted in the central farm of Sher-e-Bangla Agricultural University, Sher-e-Bangla Nagar, Dhaka-1207 during the period from November, 2014- March, 2015 to incidence of insect pest complex of BARI motor -1 and their management and their impact on natural enemies. The experiment was laid out in a Randomized Complete Block Design with three replications and five treatments applied at 7 days interval. The treatments were T1: Mechanical and Cultural practices at 7 days interval, T2: Mechanical control and spraying Ripcord 10EC @ 1.0 ml//L of water at 7 days interval, T3: Spraying Suntaf 50SP @ 1.5 g/L of water at 7 days interval, T4: Spraying Topgan 10EC @ 1.0 ml/L of water at 7 days interval and T5: Untreated control. The result reveled that among different treatments Mechanical control and spraying of Ripcord 10EC @ 1.0 ml//L of water at 7 days interval was most effective in reducing the incidence of insect pests of BARI motor-1 and leaves infestation by white fly, aphid, and epilachna beetle (5.73 , 4.76 and 5.39%respectively) and in reducing pod infestation by number at early, mid and and late pod development stage caused by pod borer the lowest infestation (3.06, 4.23 and 5.00 % respectively) whereas the highest infestation (11.97, 13.75 and 14.81% respectively) was observed in T5. As the best treatment, it reduced the highest level of pod infestation conversely it increased the maximum level of plant and pod related yield attributes, that is T2 increased the maximum height (cm), number of pods/plant, number of seeds/pod, and weight of 100-seeds (g) (50.94, 50.47, 5.27 and 17.15 respectively) of pea over control followed by Spraying Suntaf 50SP @ 1.5 g/L of water (49.04, 47.53, 5.07 and 16.63 respectively) and Topgan 10EC @ 1.0 ml/L of water (49.67, 48.47,5.13and 16.22 respectively). T2 also had the highest pod yield (2.09 t/ha) followed by T1, T3, and T4 (2.00, 2.02.and 1.987 t/ha).Considering the impact of management practices on the population of natural enemy, T2 had adversely affected and reduced the highest population of adult ladybird beetle and field ant (83.10% and 80.00% respectively) over control followed by T3 (73.70% and 78.60%) Though, T2 reduced the highest level of insect pests infestation of BARI motor-1 and including other chemical treatments, conversely they mostly harmful to the beneficial arthropod biodiversity in the pea ecosystem by reducing the maximum level of the natural enemy population than any other newer insecticides which were comparatively safe, and would be fit well into the management of insect pests of BARI motor-1. A Thesis Submitted to the Department of Entomology, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN ENTOMOLOGY SEMESTER: JULY-DECEMBER, 2015 2015-12-01T00:00:00Z http://localhost:8080/handle/123456789/1529 INCIDENCE AND MANAGEMENT PRACTICES OF INSECT PEST COMPLEX OF SWEET GOURD AND THEIR EFFECT ON NATURAL ENEMIES RAHMAN, MD. MIZANUR An experiment was carried out at Sher-e-Bangla Agricultural University central farm during the period from October 2015 to July 2016 to know the incidence and management practices of insect pest complex of sweet gourd and their effect on natural enemies. The variety; suprima (Lalteer) of Sweet gourd was selected for the study. There were seven treatments viz, (i) T1 (spraying Phytoclean @ 1.0 ml/l of water), (ii) T2 (spraying Sevin 85 SP @ 1.5g/l of water), (iii) T3 (spraying Suntaf 50 SP @ 1.5 g/l of water), (iv) T4 (spraying Ripcord 10 EC @ 1.0 ml/l of water), (v) T5 (spraying Sumialpha 5EC @ 1.0 ml/l of water), (vi) T6 (Mechanical and Cultural practices) all treatments are applied at 7 days interval and (vii) T7 (untreated control). The experiment was laid out in Randomized Complete Block Design (RCBD) with three replications. Results revealed that in terms of leaf infestation by red pumpkin beetle, epilachna beetle, whitefly and leaf cutting caterpillar; shoot infestation by red pumpkin beetle and leaf cutting caterpillar; and also fruit infestation by fruit fly and whitefly; in each case, best performance was obtained by T2 by reducing leaf, shoot and fruit infestation and also by producing highest healthy leaves, shoots and fruits. Results also revealed that the highest healthy fruit yield (61.08 tha-1) and lowest % infested fruits yield by weight (8.15%) was achieved by T2. The highest % reduction of infested fruit by weight over control (72.73%) was also obtained from the plot of this treatment (T2). A Thesis Submitted to the Faculty of Agriculture Sher-e-Bangla Agricultural University, Dhaka, in partial fulfilment of the requirements for the degree of MASTER OF SCIENCE IN ENTOMOLOGY SEMESTER: JULY - DECEMBER, 2015 2015-12-01T00:00:00Z http://localhost:8080/handle/123456789/1528 ECO-FRIENDLY MANAGEMENT OF MAJOR INSECT PESTS OF CABBAGE MAHMUD, KAZI MD. ABDULLAH-AL An experiment was conducted in the experimental field of Sher-e-Bangla Agricultural University, Dhaka, Bangladesh during the period from October, 2014 to March, 2015 to evaluate some management practices applied against major insect pestsof cabbage. The experiment was laid out in Randomized Complete Block Design replicated with three times. The management practices were six botanicals, two synthetic insecticides and one untreated control. Those were T1 (spraying of Neem leaf extract @ 3.0 ml/L of water at 7 days interval); T2 (Neem seed kernel extract @ 3.0 ml/L of water at 7 days interval); T3 (Neem oil @ 3.0 ml/L of water at 7 days interval); T4 (Garlic extract @ 3.0 ml/L of water at 7 days interval); T5 (Thuza leaf extract @ 3.0 ml/L of water at 7 days interval); T6 (Sevin 85 WP @ 2.0 g/L of water at 7 days interval); T7 (Admire 200 SL @ 1.0 ml/L of water at 7 days interval); T8 (Phytoclean @ 3.0 ml/L of water at 7 days interval) and T9 (untreated control). Among the management practices, the lowest mean infestation of cabbage leaf by semi-looper (2.0 leaves/5 plants), cabbage caterpillar (1.95 leaves/5 plants) and diamond back moth larvae (1.5 leaves/5 plants) was found in T7 that reduce highest leaf infestation over control (85.72%, 86.02% and 89.66%, respectively); whereas the highest infestation by semi-looper (14.01 leaves/5 plants), cabbage caterpillar (13.93 leaves/5 plants) and diamond back moth larvae (14.21 leaves/5 plants) was found in T9. Among the botanicals the lowest infestation of cabbage leaf by semilooper (3.76 leaves/5 plants), cabbage caterpillar (3.33 leaves/5 plants) and diamond back moth (2.12 leaves/5 plants) was found in T3. No cutworm infestation (0.0) was recorded at 3 days after transplanting (DAT) of cabbage seedlings and the cutworm infestation was initiated at 5 DAT. The maximum infestation (2.0 to 3.0 infested seedlings/plot) was recorded at 7 DAT, and then infestation declined gradually with the increase of time. But no infestation was recorded at 13 DAT. The lowest cabbage head infestation was recorded (6.08%) in T7, that gave the highest yield of cabbage (19.96 t/ha) followed by T3 (19.71 t/ha). The cutworm infestation on cabbage seedlings was ranged from 47.62 to 57.14% in the field, where the highest infestation was recorded in T5, which statistically similar with all other treatments. On the contrary, the lowest cutworm infestation (47.62%) was recorded in T2 and T6. Therefore, that management practice particularly for cutworm should be applied between 3 to 13 DAT of cabbage seedlings in the field. Considering the number of beneficial arthropods, the highest mean incidence of ants (4.53 ants/plot/inspection) was recorded in T3 but the lowest in T7 (1.73 ants/plot/inspection). The highest incidence of spiders was recorded in T9 (4.53 spiders/plot/inspection) and the lowest in T7 (1.47 spiders/plot/inspection). The highest incidence of lady bird beetles (4.75 beetles/plot/inspection) was recorded in T3 and the lowest in T7 (1.00 beetles/plot/inspection); i.e. the highest reduction of infestation was achieved by the application of Admire 200 SL treatment (T7), but it also reduced highest level beneficial arthropod population than botanical based treatments. A Thesis Submitted to the Department of Entomology, Faculty of Agriculture, Sher-e-Bangla Agricultural University, Dhaka in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE (MS) IN ENTOMOLOGY SEMESTER: JULY-DECEMBER, 2015 2015-12-01T00:00:00Z