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Abstract

Dolichos ( Lablab purpureus L.) is a drought tolerant legume used as food/feed and improvement of soil fertility. The production of dolichos in Kenya, Nakuru County is however limited by insect pests like bean aphids, pod borers and whiteflies. Field studies were conducted to determine the effect of cropping systems (dolichos monocrop and maize-dolichos intercrop) and field margin vegetation on bean aphids and their natural enemies. The experiment was conducted in Njoro (high field margin vegetation) and Rongai (low field margin vegetation) during May- December 2019 and MarchNovember 2020 cropping seasons. Bean aphid percent incidence, severity of damage and abundance was assessed at seedling, early vegetative, late vegetative and flowering dolichos growth stages. The populations of natural enemies in the plots and field margin vegetation were monitored using pan traps and sweep nets. Species diversity and composition of the field margin vegetation was determined using a quadrat. Results showed that location and cropping system had significant effects on bean aphid infestations. A high bean aphid incidence (38.13%) was observed in Njoro compared to Rongai (31.10%). Dolichos monocrop had significantly higher bean aphid infestation (51.63%) than the maize-dolichos intercrop system (24.62%). A highly diverse Shannon-weaver index was observed in Rongai (1.90) compared to Njoro (1.67). Dolichos monocrop had a more diverse Shannon-weaver index (1.8) than the maize-dolichos intercrop system (1.7). Rongai had the most abundant annual and perennial field margin vegetation species. The field margin species richness and diversity were higher in Rongai (81%) than in Njoro (54%). The findings of this study have demonstrated that a maize-dolichos intercrop in Rongai can reduce bean aphid damage in dolichos.
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Authors and Affiliations

Christine N. Mwani
1
ORCID: ORCID
Jane Nyaanga
1
Erick K. Cheruiyot
1
Joshua O. Ogendo
1
Philip K. Bett
2
Richard Mulwa
1
Philip C. Stevenson
3
Sarah E.J. Arnold
3 4
Steven R. Belmain
3

  1. Crops, Horticulture and Soils, Egerton University, Kenya
  2. Biological Sciences, Egerton University, Kenya
  3. Jodrell Laboratory, Royal Botanic Gardens Kew, Richmond, UK
  4. Nelson Mandela African Institute of Science and Technology, Arusha, Tanzania
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Abstract

Essential oils (EOs) are alternatives to synthetic insecticides used to control aphids that attack brassica species. However, the effects of species such as the Brazilian pepper tree (BPEO) Schinus terebinthifolius (Raddi), lemon eucalyptus tree (LEEO) Eucalyptus citriodora (Hook), and citronella grass (CGEO) Cymbopogon winterianus (Jowitt) on these organisms, as well as on beneficial insects, has been poorly studied. This work was aimed to evaluate the activity of BPEO, LEEO, and CGEO, at concentrations of 0.5% and 1%, on aphids Brevicoryne brassicae (Linnaeus) and Myzus persicae (Sulzer) (Hemiptera: Aphididae) applied on leaf discs and/or cabbages, as well as the chemotaxic effects on its natural enemy Diaeretiella rapae (McIntosh) (Hymenoptera: Braconidae). The results showed that the essential oil of C. winterianus had a higher mortality rate for B. brassicae (100%) (0.5%, 48 h) and M. persicae (98.99%) (1%, 48 h). The average number of aphids (both species) found on cabbage leaf discs treated with 0.5% and 1% of the three essential oils (separately) was always lower than those found on leaf discs treated with water. Essential oils at 1% presented significantly higher mortality rates for B. brassicae and M. persicae than the control treatment. Females of D. rapae were attracted to plants of green cabbage with essential oil (0.5%) of S. terebinthifolius, but did not respond to E. citriodora and were significantly responsive to plants sprayed with water when contrasted with those in the presence of C. winterianus oil.
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Authors and Affiliations

Suellen Godoy da Silva
1
Josué Sant’Ana
1
Simone Mundstock Jahnke
1
Carlos Diego Ribeiro dos Santos
1
ORCID: ORCID

  1. Federal University of Rio Grande do Sul (UFRGS), Porto Alegre, Rio Grande do Sul, Brazil
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Abstract

The yellow sugarcane aphid (YSA), Sipha flava Forbes (Homoptera: Aphididae) is an invasive insect pest of many graminaceous plants which include cultivated crops, like sorghum, sugarcane, rice, maize and several species within non-cultivated genera e.g. Digitaria, Panicum, Paspalum, and Pennisetum. A survey conducted in the Kagera region indicated an infestation by YSA in nine sugarcane varieties grown. This pest causes damage to leaves leading to yellow, purple and red discoloration. This is the first report of YSA infestation in the Tanzanian sugarcane industry. Efforts to develop control measures are still in progress.

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Authors and Affiliations

Bonaventure January
Amry Yusufu
Fadhila Urassa
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Abstract

The perspective direction in the biological regulation of insect pest populations is the combined use of different products of organic origin including fungal biological control agents. Therefore, the present study was aimed to evaluate the efficacy of products of natural origin (Aminogreen 24, Nitrogreen, Foliamin and Naturalis − strain ATCC 74040 of entomopathogenic fungus Beauveria bassiana) and one synthetic insecticide − standard (deltamethrin + thiacloprid), applied alone and in a mixture in the control of Acyrthosiphon pisum in forage pea. The study was conducted in a field experiment during the period 2017 − 2020. Infestation by leaf aphids was estimated by calculating the cumulative insect- -days ( CID). It was found that the combination of Aminogreen 24 + Naturalis had the most pronounced decrease in CID among products over the years from 2017 to 2020 and the average for the period. The greatest, significant reduction in the number of aphids occurred on day 5 (F8.5 = 15.244; p < 0.033) and day 7 (F8.5 = 33.087; p < 0.037) after treatment. On the 14th day, the decrease in CID (57.4% decrease) statistically exceeded the Proteus 110 OD standard (55.3% decrease) (F8.5 = 49.841; p < 0.049). Good protection against A. pisum was also found with Naturalis and Nitrogreen + Naturalis. There was an additive effect between Naturalis and Aminogreen 24 throughout the entire study period. The ratio of chlorophyll a (Chl a) to chlorophyll b (Chl b) and the ratio of green pigments (Chl a + + Chl b) to carotenoids determined that plants treated with Aminogreen 24 + Naturalis and Naturalis had the best physiological state. The combination of Aminogreen 24 and Naturalis gave the largest, significant, increase in stem height, followed by Nitrogreen + Naturalis. The use of Naturalis, alone and in a combination with Aminogreen 24 and Nitrogreen can be a successful alternative to conventional chemical control.
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Authors and Affiliations

Ivelina Nikolova
1

  1. Institute of Forage Crops, Agricultural Academy, Pleven, Bulgaria
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Abstract

The entomopathogenic fungi (EPF) are characterized as fungi with various functions and numerous mechanisms of action. The ability to establish themselves as beneficial endophytes provides a sound ground for their exploitation in crop production and protection. The purpose of this study was to evaluate the entomopathogenic strains of Beauveria bassiana and Mertarhizium anisopliae for their potential to colonize cucumber plants under natural environmental conditions in non-sterile substrate. Seed submersion in conidial suspension resulted in systemic colonization of cucumber plants 28 days post-inoculation. Scanning electron microscope micrographs demonstrated that conidia of both fungal genera have adhered, germinated and directly penetrated seed epidermal cells 24 hr post-submersion. Treated with EPF cucumber seeds resulted seedlings tissues of which contained a significantly higher amount of total phenolic compounds and unchanged amounts of chlorophylls. There was a significant negative effect of endophytic colonization on the Aphis gossypii population size after 5 days of exposure as well as a positive effect on cucumber growth and development 7 weeks post-inoculation. We suggest that reduction of A. gossypii population on mature Cucumis sativus plants is caused via an endophyte-triggered improvement of plant’s physiological parameters such as enhanced plant growth with subsequent increase in plant resistance through augmented production of phenolic compounds.
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Authors and Affiliations

Roshan S. Shaalan
1 2
ORCID: ORCID
Elvis Gerges
3
Wassim Habib
3
Ludmilla Ibrahim
2

  1. Department of Plant Protection, University of Forestry, Sofia, Bulgaria
  2. Department of Plant Protection, Lebanese University, Beirut, Lebanon
  3. Department of Plant Protection, Lebanese Agricultural Research Institute, Lebanon
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Abstract

The experiments were carried out on red beet (cv. Czerwona Kula) from 1997 to 2000. Four combinations differing in ground coverage by weeds were analyzed. During the whole observation period, the greatest numbers of aphids were noticed on the plots kept weed free, while the lowest numbers of aphids were found on the plots where the weeds were not removed and exceptionally, in 1997, on the plots weeded twice. Over the years of observations, the greatest numbers of larvae and adult of Coccinellidae were found on the plots kept weed free, where the bean aphids were the most numerous. Among the four species of adult coccinellid beetles found in the colonies of black bean aphids, the most dominant was Coccinella septempunctata L.
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Authors and Affiliations

Maria Pobożniak
Andrzej Wnuk

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