Browsing by Author "YESMIN, MONOWARA"

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    BIO-ECOLOGY HOST PREFERENCE AND MANAGEMENT OF CUCURBIT FRUIT FLY
    (DEPARTMENT OF ENTOMOLOGY, 2019) YESMIN, MONOWARA
    Thestudy was conducted in the experimental field and laboratory of Sher-e-Bangla Agricultural University (SAU), Sher-e-Bangla Nagar, Dhaka, Bangladesh, during March 2016 to August 2018 to evaluate bio-ecology, host preference and management of cucurbit fruit fly. In Bangladesh, farmers were faced problem in cultivation of cucurbitaceous crops in the field due to cucurbit fruit fly (Bactrocera cucurbitae), the main insect pest of cucurbitaceous crops.The study revealed that, cucurbit fruit fly can attack all types of cucurbitaceous crops. But the infestation become low in kharif season and high in rabi season. Among different types of cucurbitaceous crops cucurbit fruit fly attacks more in bitter gourd and less in sweet gourd. In bio-ecology study, theaverage days for egg incubation (1.7 and 2.7 days), larval period (4.3 and 5.5 days), pupal period (5.9 and 9.8 days),male adult longevity (5.9 and 13.3 days) and female adult longevity (6.7 and 15.8 days) of cucurbit fruit fly were observed at room temperature(±30℃ and ± 85 RH) and laboratory condition(25℃ and 80% RH), respectively.Average ovipositional period of adult female cucurbit fruit flies under room temperature and laboratory condition were 1.4 and 2.9 days, respectively.Average length and breadth of cucurbit fruit flies eggs, larvae, pupa, adult male and female were 1.14 and 0.22,7.9and 2.04,6.2 and 2.38,7.4 and 11.4 and 9.3 and 15.69 mm, respectively.In early, mid and late fruiting stage, the lowest fruit infestation by number and percent fruit infestationby number over control were found in T 2 (6.28 and 76.72%, 12.89 and 83.78% and 14.67 and 83.20%, respectively), using the poison bait trap in the field. In early, mid and late fruiting stage, the lowest fruit infestation by weight and percent fruit infestationby weight over control were found in T 2 (19.30 and 78.73%, 6.18 and 92.48% and 11.98 and 86.63%, respectively). In early, mid and late fruiting stage, the highest percent edible portion of infested bitter gourd was found in T 2 (66.58%, 75.25% and 75.84%, respectively). The highest number of fruit per plot, single fruit weight, length of single healthy fruit and yield of bitter gourd were found in T 2 (62.33 fruits/plot, 86.04g, 20.66 cm and 17.87 ton/ha, respectively). From the comparative study, poison bait trap (50.00 fruit fly/ trap) was more effective than pheromone trap (19.00 fruit fly/ trap) in terms of capturing adult cucurbit fruit flies throughout the cropping season. The highest benefit cost ratio (BCR) (2.47) was calculated in T 2 , where the total adjusted net return was counted as benefit. In the study of IPM packages for cucurbit fruit fly management, the highest captured fruit flies (36.00 flies) was found in IPM package 1comprised with pheromone trap along with poison bait trap.In early, mid and late fruiting stage, the lowest fruit infestation by number, fruit infestation by weight, edible portion of infested fruit, length of single fruit and girth of single fruit were found in IPM package 1 (22.44%, 11.83%, 90.75%, 21.61 cm and 12.78 cm; 16.66%, 17.37%, 87.67%, 23.22 cm and 14.05 cm and 13.68%, 25.87%, 92.91%, 22.75 cm and 13.24 cm, respectively). The highest number of fruit per plot, single fruit weight and yield of bitter gourd were found in IPM package 1 (76.33 fruits/plot, 50.13g and 12.76 ton/ha, respectively)in the field.
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    VARIETAL PREFERENCE AND MANAGEMENT OF TOMATO FRUIT BORER, Helicoverpa armigera (Hubner)
    (Department of Entomology, Sher-e-Bangla Agricultural University, Dhaka-1207, 2007-06) YESMIN, MONOWARA
    iwo set ol experiment were conducted in the experimental held of Sher-e-Bangla Agricultural University. Dhaka, t3angladesh during the period from October 2006 to March 2007 to screen out some selected tomato varieties/ genotypes for resistance against tomato fruit borer, Iielicoierpa annigera (I lubner) and to evaluate the efficacy of sonic management practices applied against tomato fruit borer. Considering the Ijeki screening of dilicrent tomato varieties Ibr resistance against tomato Iiui I borer. among nine tomato varieties evaluated against tomato fruit borer. the variety BAIt 1-2 (Ratan) and BARI-$ were the susceptible variety to tomato fruit borer and the variety I3ARI-3. BARI-7, I3AItI-9. BINA-3 and I3INA-4 were the moderately resistant, whereas L3INA-1 and I3INA-2 were the highly resistant. And the trend of resistance to tomato fruit borer is BINA-1 > I3INA-2 > BINA-4 :' I3INA-3 > i3AltI-9 I3ARI-7 > I3ARI-3 > BARI-8 > BARI-2 (Ratan). The highest yield loss (15.17%) as recorded for the variety I3ARI-2 (Ratan) and the lowest yield loss (6A60 was recorded for the variety BINA-2 followed by Bl>.A-1 (7.06%). The highest sield (74.49 Uha) was recorded for the variety I3tNA-1 followed by L3INA-2 (73.24 tha) and 13A1( L-2/Ratan (73.00 t!ha) and the lowest vickl (54.98 t!ha) was recorded in the variety (3ARI-7 followed by I3ARI-3 (61.69 t:ha). I3LNA-4 (62.42) and l3tUt t- '.unetieS. utinsidering the cOeds of diticrent management practices applied against tomato fruit norer at earl', mid and late fruiting stages. the level of inkstation 1011owed more or less similar trend for both by number and weight of tomato. where the treatment l, (comprising Neem oil @ 3 nil/i, otwater sprayed at 7 (lays interval i plants supported by bamboo stick) pertormed maximum number and weight of healthy fruitiplant and fl1inimUl1i number and weight of infested fruit as well as lowest percent fruit inibiation in number and weight whereas in Ts (Untreated control treatment) the situation is totally overturned in this trial. The tomato fruit yield increases due to decrease the percent Fruit infestation by tomato fruit borer, also with the increase of the plant height and number of branch per plant. Lii considering the economic analysis of the difkrent treatments in controlling tomato fruit borer, the highest benefit cost ratio (3.53) was recorded in the treatment T6 (consisting of' Neem oil 3 nil/litre of water sprayed at 7 days mten'al i plants supported with bamboo stick). On the other hand, the minimum benefit cost ratio (1.31) was recorded in treatment 'f. But no management cost was required [or T5 (rca trnent (tint rented control).