Time filter

Source Type

Ali M.,University of Punjab | Ashfaq M.,University of Agriculture at Faisalabad | Rana N.,University of Agriculture at Faisalabad | Haider M.S.,University of Punjab | And 2 more authors.
Pakistan Journal of Agricultural Sciences | Year: 2014

The jassid (Amrasca biguttula biguttula (Ishida) is an emerging serious pest of brinjal crop in Pakistan. The present study was carried out for evaluating relative plant resistance/susceptibility of different cultivars of brinjal against the jassid during summer 2009 at PARS, Faisalabad, Pakistan. Fourteen cultivars of brinjal viz. Pusa Purple Round (PPR), Rubi, Vrib-01, Vrib-02-F1, Dilnasheen,Vrib-0401, Vrib-04, Bemissal, Vrib-9901, Nirala, Qaisar, JK_Kajal, Cluster King and Purple QL were tested for their susceptibility against jassid. All the tested cultivars showed significant differences (P≤0.05) for the tested parameters viz. pest preference, host plant susceptibility indices (HPSI) as well as yield/plot. The peak infestation time of the pest after sowing of crop was 1st week of June after which it gradually declined. The cultivars Nirala, Bemissal and Vrib-04 appeared as comparatively susceptible showing high population of jassid/leaf while Vrib-9901, Vrib-0401, and Vrib-02-F1 appeared as intermediate and Rubi, Vrib-01 and Cluster King were observed comparatively as resistant ones with least number of jassid/leaf. The cultivar Bemissal proved the most susceptible varietyamong the tested ones showing maximum level of HPSI(18%) and minimum fruit yield (44.66 kg/plot) while Rubi proved the most resistant cultivar with minimum HPSI (7%) and a maximum fruit yield (81.0 kg/plot). © 2014 University of Agriculture. All rights reserved.

Nadeem S.,Nuclear Institute for Agriculture and Biology NIAB | Hamed M.,Nuclear Institute for Agriculture and Biology NIAB | Nadeem M.K.,Pest Warning and Quality Control of Pesticides | Hasnain M.,Entomological Research Station
Pakistan Journal of Zoology | Year: 2014

Green lacewing, Chrysoperla carnea (Stephens) (Neuroptera: Chrysopidae) among the predators is an important component of biological control in integrated pest management of crops and vegetables. Reproductive characteristics of C. carnea lead towards its effectiveness against target pests in a particular set of environmental conditions. The present study was carried out to investigate the reproductive characteristics of C. carnea under laboratory conditions. Effect of low temperature and storage durations on the reproductive parameters of C. carnea at adult stage on different temperature conditions have showed that the reproductive parameters as pre-oviposition period, oviposition and adult life span were comparatively better for both short and long term storage durations. Although the adult survived after stored at 6 and 8°C temperature conditions, storage was better for both long and short term durations at 10°C. So, it is obvious from the present findings that whenever, needed to conserve particular strains in laboratories for experimentation or field releases, storage at 10°C gave prolonged survival to adults without the detrimental effects. © Copyright 2014 Zoological Society of Pakistan.

Hameed A.,Cotton Research Station | Shahzad M.S.,Pest Warning and Quality Control of Pesticides | Ahmad S.,Cotton Research Station | Karar H.,Entomological Research Sub Station
Pakistan Journal of Zoology | Year: 2015

Weather plays a critical role in regulating abundance of cotton insects. Pests forecasting for monitoring and management of such deleterious insects particularly in developing countries where pest management is costly is very important . Keeping in view such delicate issues, pests forecasting model on the basis of past 5 years pests abundance data is proposed. Population data was taken from different locations of Multan district from 2006- 2010 by Pests Warning Wing of Agriculture Department, Govt. of Punjab, Pakistan. Weather in relation to Helicoverpa armigera (Hub.) abundance was summarized on the basis of multivariate regression and correlation tactics. Results revealed that maximum temperature had negative impact on American bollworm population while relative humidity had highly significant positive effect on Helicoverpa armigera population. ARIMA model forecast American bollworm percent hot spots will decrease with minimum value -1.4 to maximum value 1.05. Copyright © 2015 Zoological Society of Pakistan.

Ullah Z.,Pest Warning and Quality Control of Pesticides | Javed N.,University of Agriculture FaisalabadPunjab | Khan S.A.,University of Agriculture FaisalabadPunjab | Haq I.U.,University of Agriculture FaisalabadPunjab | Shakeel Q.,University of Sargodha
International Journal of Vegetable Science | Year: 2015

Biopesticides are being tested in control parasitic nematodes as a replacement for synthetic chemicals. This study was undertaken to investigate effects of the biopesticides abamectin, emamectin, and biosal on egg hatch and mortality of second instar juveniles (J2) of Meloidogyne incognita (Kofoid and White) Chitwood under laboratory and field conditions on tomato (Solanum lycopersicum L). Treatments consisted of the biopesticides and water (control). Numbers of J2 hatched was determined at 1, 3, and 6 days and mortality of J2 at 12, 24, and 48 h after inoculation. Evaluation of biopesticides under field conditions was for yield, number of flowers, numbers of fruit per plant, average fruit weight, shoot and root length, numbers of galls and egg masses per root system, and nematode rate of reproduction. Abamectin was more effective than emamectin and biosal against M. incognita under laboratory and field conditions. Application of abamectin produced the highest juvenile mortality and increased fruit weight, reduction in egg hatch, gall number, egg mass number, and rate of reproduction. Abamectin can be used under field conditions for management of M. incognita. Copyright © Taylor & Francis Group, LLC.

Dutcher J.D.,University of Georgia | Karar H.,Entomological Research Sub Station | Abbas G.,Pest Warning and Quality Control of Pesticides
Insects | Year: 2012

Seasonal occurrence of aphids and aphidophagous insects was monitored for six years (2006-2011) from full leaf expansion in May to leaf fall in October in Desirable variety pecan trees that were not treated with insecticides. Aphid outbreaks occurred two times per season, once in the spring and again in the late summer. Yellow pecan and blackmargined aphids exceeded the recommended treatment thresholds one time and black pecan aphids exceeded the recommended treatment levels three times over the six seasons. Increases in aphidophagous insect abundance coincided with aphid outbreaks in five of the six seasons. Among aphidophagous insects Harmonia axyridis and Olla v-nigrum were frequently collected in both the tree canopy and at the ground level, whereas, Coccinella septempunctata, Hippodamia convergens were rarely found in the tree canopy and commonly found at the ground level. Green lacewing abundance was higher in the ground level than in the tree canopy. Brown lacewings were more abundant in the tree canopy than at the ground level. Dolichopodid and syrphid fly abundance, at the ground level increased during peak aphid abundance in the tree canopy. Application of an aqueous solution of fermenting molasses to the pecan foliage during an aphid outbreak significantly increased the abundance of ladybeetles and lacewings and significantly reduced the abundance of yellow pecan, blackmargined and black pecan aphids. © 2012 by the authors; licensee MDPI, Basel, Switzerland.

Discover hidden collaborations