Response of Pisum sativum (Fabales: Fabaceae) to Sitona lineatus (Coleoptera: Curculionidae) Infestation: Effect of Adult Weevil Density on Damage, Larval Population, and Yield Loss

2011 ◽  
Vol 104 (5) ◽  
pp. 1550-1560 ◽  
Author(s):  
M. A. Vankosky ◽  
H. A. Cárcamo ◽  
L. M. Dosdall
Keyword(s):  
Pisum Sativum ◽  
Yield Loss ◽  
Larval Population ◽  
Adult Weevil

ESTIMATION OF PEA YIELD LOSS FROM SEVERE ROOT ROT AND DROUGHT STRESS USING AERIAL PHOTOGRAPHS AND A LOSS CONVERSION FACTOR

1978 ◽  
Vol 58 (1) ◽  
pp. 159-164 ◽  
Author(s):  
P. K. BASU ◽  
H. R. JACKSON ◽  
V. R. WALLEN
Keyword(s):  
Drought Stress ◽  
Pisum Sativum ◽  
Root Rot ◽  
Yield Loss ◽  
Conversion Factor ◽  
Aerial Photographs ◽  
Average Yield ◽  
Affected Area ◽  
Black And White ◽  
Pisum Sativum L

Vertical aerial photographs were taken over commercial pea (Pisum sativum L.) fields in the Picton-Wellington region, Ontario, in 1975 (a drought year) and in 1976 (a non-drought year) using Kodak Aerochrome Infrared film 2443. Optical separations into black and white images were necessary to assist in delineating healthy crop boundaries from severe root rot- and drought-affected areas (37.14%) as well as void areas (5.29%) from 1975 photographs of 12 selected fields. In these fields, excluding the void areas, an estimated yield loss of 22.7% was calculated by multiplying the percentage of the affected area by an average yield loss conversion factor of 0.61 derived from all available data from greenhouse- and field-grown plants of several commercial pea cultivars.

Efficacy of Coragen 20 SC against Lepidopteran Pest in Greengram and Its Compatibility with Bacillus thuringiensis Isolates

2020 ◽  
Author(s):  
G.K. Sujayanand ◽  
Sonika Pandey ◽  
Sanjay M. Bandi
Keyword(s):  
Bacillus Thuringiensis ◽  
Field Experiments ◽  
Yield Loss ◽  
Insect Pest ◽  
Cost Ratio ◽  
Percent Reduction ◽  
Larval Population ◽  
Growth And Survival ◽  
Benefit Cost Ratio ◽  
Polyphagous Insect

Background: Green gram, Vigna radiata (L.) R. Wilczek is third most important pulse crop cultivated in India. The two key insect pest viz., pod borer, Helicoverpa armigera Hubner and Tobacco leaf caterpillar, Spodoptera litura Fabricius inflicts heavy yield loss in greengram. As these are polyphagous insect pest and the crop is a short duration crop, immediate management strategy such as chemical control is very much essential to check its yield loss. The current study reports the efficacy of novel insecticide i.e. Coragen® 20 SC against above cited two insect pest in greengram. Further its effect on non-target insects and its influence on growth and survival of Bacillus thuringiensis were evaluated. Methods: Field experiments were conducted to evaluate the efficacy of Coragen® 20 SC (at four doses viz., 75 ml ha-1, 100 ml ha-1, 125 ml ha-1 150 ml ha-1), chlorpyriphos 20 EC @ 2.5 l ha-1 and emamectin benzoate 5 SG @ 220 g ha-1 against H. armigera and S. litura during kharif 2018 and 2019. Based on larval load per plant, the percent reduction in larval counts was estimated based on Henderson and Tilton method. The benefit cost ratio (BCR) was worked out for each respective year based on seed yield and net returns. Result: Coragen® 20 SC at 125 ml ha-1 and 150 ml ha-1 had resulted in highest percent reduction in larval population over control. Simultaneously, the highest BCR during kharif 2018 (6.29, 4.21) and 2019 (5.95, 5.64) were recorded from above 2 treatments. Further, Coragen® 20 SC showed compatibility with 5 Bt isolates evaluated, i.e Bt growth didn’t inhibited in nutrient agar containing field dose of Coragen 20 SC.

scholarly journals Kerusakan Lima Varietas Padi Akibat Serangan Hama Penggerek Batang di Desa Savanajaya, Kecamatan Waeapo, Kabupaten Buru

2020 ◽  
Vol 16 (2) ◽  
pp. 180-186
Author(s):  
Muhamad F Umakamea ◽  
John A Patty ◽  
Ria Y Rumthe
Keyword(s):  
Yield Loss ◽  
Insect Pests ◽  
Population Data ◽  
Stem Borer ◽  
Survey Method ◽  
Rice Varieties ◽  
Larval Population ◽  
White Rice ◽  
Rice Productivity ◽  
Rice Stem Borer

 One of the obstacles in efforts to increase rice productivity is the damage caused by the attack of the rice stem borer. Annual yield loss caused this insect pests is quite high, reaching 10-30%. The attack of stem borer has long been encountered and is a problem in rice producing areas on Buru Island, such as in Savanajaya Village. This study aimed to obtain data on the types of pests, population levels and the intensity of damage in five rice varieties due to stem borer attact and to determine the varieties that had the lowest population and damage intensity in the Saavanajaya Village, Waeapo District, Buru Regency. The method used was a survey method that focused on five varieties of rice cultivated by farmers, to obtain population data and the intensity of damage. The results showed that the type of pest that attacked the five rice varieties of IR-64 variety in Savanajaya Village was the white rice stem borer (Scirpophaga innotata), with the highest larval population (per cluster) of 1.27 individuals and the intensity of damage 5.20%, followed by Cigeulis variety with a larval population of 1.17 individuals and damage intensity of 4.70%, the Ciherang variety with a larval population of 1.07 individuals and damage intensity of was 4.25%, the Mekongan variety with a larval population of 1.1 individuals and damage intensity of 4.15%, and the lowest was the Membramo variety with a larval population of 1.03 larvae and damage intensity of 4.12%. The damage intensity of at the study site, although different between varieties, could all be classified into the category of mild attack. Keywords: damage intensity, rice varieties, Savanajaya, stem borer   ABSTRAK Salah satu kendala dalam upaya peningkatan produktivitas padi adalah kerusakan yang disebabkan oleh serangan penggerek batang padi. Kehilangan hasil setiap tahun yang disebabkan oleh serangga hama ini padi cukup tinggi, bisa mencapai 10-30%. Serangan hama penggerek batang telah lama ditemui dan menjadi masalah di daerah produsen padi di Pulau Buru, seperti di Desa Savanajaya. Penelitian ini bertujuan untuk mendapatkan data jenis hama, jumlah populasi serta intensitas kerusakan pada lima varietas padi akibat serangan hama penggerek batang serta menentukan varietas yang memiliki populasi dan intensitas kerusakan terendah di Desa Savanajaya, Kecamatan Waeapo, Kabupaten Buru. Metode yang digunakan adalah survey yang difokuskan pada lima varietas padi yang diusahakan petani, untuk mendapatkan data populasi dan ntensitas kerusakan. Hasil penelitian menunjukkan bahwa jenis hama yang menyerang lima varietas padi varietas IR-64 di Desa Savanajaya adalah penggerek batang padi putih (Scirpophaga innotata), dengan populasi larva (per rumpun) tertinggi 1,27 ekor dan intensitas kerusakan 5.20%, diikuti oleh varietas Cigeulis dengan populasi larva 1,17 ekor dan internsitas kerusakan 4.70%, varietas Ciherang dengan populasi larva 1.07 ekor dan intensitas kerusakan 4.25%, varietas Mekongan dengan populasi larva 1.1 ekor dan intensitas kerusakan 4.15 %, dan yang terendah varietas Membramo dengan populasi larva 1.03 ekor dan intensitas kerusakan 4.12%. Intensitas kerusakan di lokasi penelitian, walaupun berbeda antar varietas tetapi semuanya dapat diklasifilasikan ke dalam kategori serangan ringan. Kata kunci: intensitas kerusakan, penggerek batang, Savanajaya, varietas padi,

PREHARVEST DESICCATION OF GREEN-SEEDED FIELD PEAS WITH DIQUAT

1982 ◽  
Vol 62 (3) ◽  
pp. 555-560 ◽  
Author(s):  
G. H. GUBBELS
Keyword(s):  
Pisum Sativum ◽  
Protein Content ◽  
Seed Size ◽  
Yield Loss ◽  
Cooking Quality ◽  
Quality Characteristics ◽  
Spray Application ◽  
Green Color ◽  
Pisum Sativum L ◽  
Field Peas

Diquat treatments were applied to green-seeded field peas (Pisum sativum L.) over a 5-yr period to determine the effect of applications at various stages of maturity on some agronomic and quality characteristics. The spray application effectively hastened drying of the plants, eliminating the need for windrowing. The rate of 0.28 kg a.i./ha was adequate. The earlier harvesting permitted by the treatments reduced loss of green color and germinability associated with weathering and reduced yield loss from shattering. Applications made as early as the 50% brown pod stage did not markedly affect yield, protein content, seed size, cooking quality or germinability. However, a later stage of spraying may be advisable under conditions of slow maturation.

Development of Erysiphe pisi (Powdery Mildew) on Normal and Albino Mutants of Pea (Pisum sativum L.)

2000 ◽  
Vol 148 (11-12) ◽  
pp. 591-595 ◽  
Author(s):  
U. P. Singh ◽  
B. Prithiviraj ◽  
B. K. Sarma
Keyword(s):  
Powdery Mildew ◽  
Pisum Sativum ◽  
Erysiphe Pisi ◽  
Pisum Sativum L

Histone variants from pea (Pisum sativum): Their differential presence in fractions obtained by DNase I digestion of nuclei

1990 ◽  
Vol 78 (4) ◽  
pp. 602-608 ◽  
Author(s):  
M. Isabel Rodrigo ◽  
Luis Franco
Keyword(s):  
Pisum Sativum ◽  
Histone Variants ◽  
Dnase I

Influence of selenium on uptake and toxicity of copper and cadmium in pea (Pisum sativum) and wheat (Triticum aestivum)

1994 ◽  
Vol 90 (4) ◽  
pp. 637-644
Author(s):  
Tommy Landberg ◽  
Maria Greger
Keyword(s):  
Triticum Aestivum ◽  
Pisum Sativum
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