http://103.7.193.12:8080/xmlui/handle/123456789/13 DEPARTMENT OF ENTOMOLOGY (ENT) 2026-06-09T23:43:19Z http://103.7.193.12:8080/xmlui/handle/123456789/2146 INVESTIGATION OF DRIED FISH PEST SPECIES IN NORTHERN BANGLADESH AND MANAGEMENT OF Dermestes maculatus DEGEER (COLEOPTERA: DERMESTIDAE) WITH BOTANICALS AND MINERAL USED AS FOOD ADDITIVES MST. ARIFUNNAHAR The research work conducted on pest complex, incidence, seasonal abundance and damage intensity of dried fish consumed in northern Bangladesh as well as to investigate the biological activity of edible botanicals and mineral against Dermestes maculatus. Eight sp. of pests D.maculatus, Necrobia rufipes, Calliphora sp., Musca domestica, Forficula auricularia, Lardoglyphus spp., Solenopsis invicta and D.frischii were found to infest. Among them, two species, D. maculatus and N. rufipes were major and the rests were minor pests. D. maculatus and N. rufipes infested 15 and 13 species of the total tested dried fishes which were almost 35.7 and 31.0%, respectively. The population density of both species of adults and larvae were peak in mid June to mid November. The highest mortality (100%) of adult and larvae of D. maculatus were observed when fed on dried L. calcarifer mixed with salt and black pepper powders in primary screening. In the secondary screening test, the highest adult and larval mortalities (100%) occurred at 7th and 3rd days after treatment while applied salt and black pepper at 16g and salt at 14g. The lowest LT50 values 2.80; 1.45 days and 2.65; 2.14 days for the adults and larvae were observed while applied Salt and black pepper at 16g, respectively. Repellency rate was the maximum 100% when applied salt and black pepper at 12, 14, 16g both for the adult and larva and repellency class was V. Among the treatments, salt was observed to be the most effective and no weight loss of L. calcarifer was measured whereas the control showed highest 24.5%. Black pepper showed the second lowest weight loss 5.3% and 8.3% against the adult and larva at 16g. The highest weight loss 30.3% was found by larva in the control and no weight loss was found in salt in every doses. The maximum adult mortality 100% was recorded on 6th DAT with shortest LT50 3.07 days when applied mixture of 14g black pepper and 16g turmeric. The maximum larval mortality (100%) was observed on 4th DAT when applied mixture of black pepper (14g) and turmeric (16g) with shortest LT50 2.31 days. Therefore, this mixture could have used to manage the pest. INVESTIGATION OF DRIED FISH PEST SPECIES IN NORTHERN BANGLADESH AND MANAGEMENT OF Dermestes maculatus DEGEER (COLEOPTERA: DERMESTIDAE) WITH BOTANICALS AND MINERAL USED AS FOOD ADDITIVES; A THESIS BY MST. ARIFUNNAHAR, REGISTRATION NO. 1305013; DOCTOR OF PHILOSOPHY (Ph.D.) IN ENTOMOLOGY, DEPARTMENT OF ENTOMOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY DINAJPUR, SEPTEMBER, 2021. 2021-09-01T00:00:00Z http://103.7.193.12:8080/xmlui/handle/123456789/2125 BIOLOGY AND HOST PREFERENCE OF SAWTOOTHED GRAIN BEETLE, Oryzaephilus surinamensis L. (COLEOPTERA: SILVANIDAE) ON DATE CULTIVARS AND THEIR MANAGEMENT USING EDIBLE PLANT PRODUCTS JAHAN, MST. LAMIA The sawtoothed grain beetle, Oryzaephilus surinamensis L. (Coleoptera: Silvanidae) constitutes one of the major pests of date palm in storage conditions throughout the world. The experiments were conducted to find out the biology of O. surinamensis while fed on five different date cultivars (Mariyam, Medjul, Dabas, Zahidi and Saad) as well as to evaluate the efficacy of edible plant products against the pest. Both the experiments were conducted at laboratory conditions prevailed 30 ± 5 °C, 80 ± 10 % RH. The study revealed that the highest incubation period of the insect was recorded 3.92 days on Saad but minimum 3.42 days on Mariyam. The larval period ranged from 12.13 (Mariyam) to 14.08 days (Saad) while pupal period 4.56 (Mariyam) to 5.14 days (Saad). The larval to pupal period was 16.69 to 19.22 days. The duration of egg to adult stages of female from 20.1 to 23.14 days. The highest and the lowest pre-oviposition periods were 7.35 (Dabas) and 6.15 days (Mariyam), respectively. The Mariyam date cultivar experienced the highest damage of 22.5 % in October but the lowest 4.5 % in Saad during the month of December. The maximum (91.92 %) egg hatching was found in Mariyam date cultivar while minimum (81.72 %) was noticed in Dabas date cultivar. Survival and mortality percentage of larvae and pupae were recorded and pupal survival rate was found higher than larval survival rate. The highest larval and pupal survival rate was 91.58 and 93.57 %, respectively, in Mariyam date cultivar. Some edible plant products with different concentration (4 %, 2 %, and 0.05 %) were tested against O. surinamensis on different dates to determine the mortality percentage. Clove powder showed 100 % mortality at 4 % and 2 % concentrations after 5 and 7 days which were the highest among the edible plant powders. BIOLOGY AND HOST PREFERENCE OF SAWTOOTHED GRAIN BEETLE, Oryzaephilus surinamensis L. (COLEOPTERA: SILVANIDAE) ON DATE CULTIVARS AND THEIR MANAGEMENT USING EDIBLE PLANT PRODUCTS; A THESIS BY MST. LAMIA JAHAN, REGISTRATION NUMBER: 2205090, THESIS SEMESTER: JULY-DECEMBER, 2023, SESSION: 2022-2023; MASTER OF SCIENCE (MS) IN ENTOMOLOGY, DEPARTMENT OF ENTOMOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200; DECEMBER, 2023. 2023-12-01T00:00:00Z http://103.7.193.12:8080/xmlui/handle/123456789/2124 EVALUATION OF FIVE BIO-RATIONAL PESTICIDES AGAINST Bactrocera cucurbitae (COQUILLETT) IN BITTER GOURD FIELD AND THEIR RESIDUAL EFFECT ON Coccinella septempunctata (L.) IN LABORATORY CONDITIONS HASNAT, MD. ARIF The cucurbit fruit fly (Bactrocera cucurbitae Coquillett) is one of the most important and devastating insect pests for several cucurbits. Biopesticides are an ecofriendly manner to minimize the infestation caused by insect pests. To evaluate the efficacy of five selected biopesticides viz. Ecomec 1.8 EC (Abamectin), Sunmectin 1.8 EC (Abamectin), Lumectin 10 WDG (Emamectin benzoate and Lufenuron), Tracer 45 SC (Spinosad), Green Meta (Metarhizium anisopliae) and control against cucurbit fruit fly on bitter gourd were studied from January to June 2023 with consecutive three sprays. The experiment was designed with Randomized Complete Block Design (RCBD) and replicated thrice. The data on the number and weight of healthy and infested fruits and the number of maggots inside the infested fruits were collected. Residual effects on Coccinella septempunctata in the laboratory conditions was also performed. The result showed that all the treatments had different levels of infestation reduction and significantly differed from control. The lowest percent of fruit infestation (16.20%, 10.44% and 10.44%) and the highest percent infestation reduction over control (68.75%, 84.39% and 85.33%) were found when applied Tracer 45 SC (Spinosad) after 7 days of 1st, 2nd and 3rd spray, respectively. Spinosad also showed the highest weight of healthy fruits (0.0426, 0.621 and 0.776 kg plot-1) and the lowest percent infestation by weight (11.12, 6.15 and 5.66%) in all the 3 consecutive picking after 1st, 2nd and 3rd spray. The cumulative yield was found the highest (1.832 kg plot-1) with 3.62 times increase over the control when applied Tracer 45 SC (Spinosad). The number of maggots inside the infested fruits was also found the lowest (2.33) in Tracer 45 SC treated plot and the highest (6.67) in the control plot. In the case of residual effect on C. septempunctata in the laboratory conditions, Sunmectin 1.8 EC (Abamectin) had the longest residual effect on adults of C. septempunctata causing 20% mortality at 7 days after treatment (DAT), but low toxicity against fruit fly. However, Green Meta (M. anisopliae) (0.00%) had the shortest residual effect on adults of C. septempunctata followed by Tracer 45 SC (Spinosad) at 3 DAT. Therefore, Tracer 45 SC (Spinosad) and Green Meta (M. anisopliae) can be used for the management of cucurbit fruit flies for their higher efficacy against fruit fly and lower residual activity against C. septempunctata. EVALUATION OF FIVE BIO-RATIONAL PESTICIDES AGAINST Bactrocera cucurbitae (COQUILLETT) IN BITTER GOURD FIELD AND THEIR RESIDUAL EFFECT ON Coccinella septempunctata (L.) IN LABORATORY CONDITIONS; ATHESIS BY MD. ARIF HASNAT, REGISTRATION NUMBER: 2205087, SEMESTER: JULY-DECEMBER, 2023; MASTER OF SCIENCE (M.S.) IN ENTOMOLOGY , DEPARTMENT OF ENTOMOLOGY , HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR-5200; DECEMBER, 2023. 2023-12-01T00:00:00Z http://103.7.193.12:8080/xmlui/handle/123456789/2123 ANTIMITE ACTIVITY OF Capsicum chinense L. FRUIT EXTRACT AGAINST Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE) TITHY, ANIKA RAHMAN Two-spotted spider mite, Tetranychus urticae Koch (Acari: Tetranychidae) is a destructive pest that causes significant damage to vegetables, flowers, fruits and ornamental crops worldwide. The acaricidal, ovicidal, repellent and oviposition deterrent activities of Capsicum chinense L. against T. urticae were evaluated under laboratory conditions. The ethanolic fruit extract of C. chinense was tested at 0.25, 0.5, 1.0, 1.5 and 2.0% concentrations. The result showed that all the concentrations had toxic, ovicidal activity, repellent, and oviposition deterrent effects on T. urticae. With increasing doses and time, the mortality percentage of adults and nymphs (after 24, 48 and 72 h) gradually increased. Extracts at 2.0% concentration showed the highest mortality of adults (80.0%) and nymphs (93.0%) after 72 h exposure. Mortality was greater in nymphs (29.0 – 93.0%) than in adult females (12.0 – 80.0%) when treated with different concentrations. Ovicidal activity (after 7 days) results showed that the lowest egg hatchability was (59.0%) at 2% concentration with the highest corresponding efficacy (37.23%). The LD50 values for adults were 3.39, 2.24 and 0.50 and for nymphs were 1.29, 0.38 and 0.23 after 24 h, 48 h and 72 h respectively whereas for eggs were 5.63 after 7days. The ethanolic fruit extract of C. chinense was also found to be effective as a repellent and oviposition deterrence against T. urticae, with the repellency and oviposition deterrent rate increasing with doses and time, and showed a significant effect at the highest concentration (2.0%) in both cases. The oviposition deterrent was shown to be more prominent than the repellent effect. According to the findings, the ethanolic fruit extract of C. chinense has great potential to develop as a bio-acaricide for T. urticae management. ANTIMITE ACTIVITY OF Capsicum chinense L. FRUIT EXTRACT AGAINST Tetranychus urticae KOCH (ACARI: TETRANYCHIDAE); A THESIS BY ANIKA RAHMAN TITHY, Registration No. 1701209, Session: 2022-2023, Semester: July-December, 2023; MASTER OF SCIENCE (MS) IN ENTOMOLOGY, DEPARTMENT OF ENTOMOLOGY, HAJEE MOHAMMAD DANESH SCIENCE AND TECHNOLOGY UNIVERSITY, DINAJPUR; DECEMBER 2023. 2023-12-01T00:00:00Z