Mechanism of resistance in cowpea(Vigna unguiculata(L.) Waip.) genotype, TVx 3236, to the bean flower thrips,Megalurothrips sjostedti(Trybom) (Thysanoptera: Thripidae). 2. Nonpreference and antibiosis

Losses caused by flower thrips in cowpea are important. These pests can cause from 60% to total crop yield loss. There is, therefore , an urgent need to address this issue. This work has been undertaken to identify sources of resistance to thrips in cowpea. Twenty cowpea genotypes were screened at Kamboinsé research station under improve netting in pots. The number of aborted flowers per line, the percentage of damage to flowers and stipules, and the number of thrips per genotype were evaluated. The results revealed the existence of six genotype of cowpea resistant to thrips. Among these genotypes three are already known thrips resistant lines (TVU1509, TVx3236 and Sanzi). Moreover, Sanzi showed interesting potentialities that maybe exploited. The new identified lines are Nafi, variety popularized in 2012 and variety KVx780-3 which is being popularized. The KVx165-14-1 (old popular variety) showed sources of tolerances while the KN1 genotype was susceptible to thrips. In another hand, all the wild genotypes showed high susceptibility to thrips.

Download Full-text

Field Activity of Three Mixture Levels of Plant Extract Formulations for the Management of Post-Flowering Insect Pests of Cowpea,Vigna unguiculata(L.) Walp–The Flower Thrips,Megalurothrips sjostedti(Trybom)

Journal of Sustainable Agriculture ◽

10.1300/j064v28n04_05 ◽

2006 ◽

Vol 28 (4) ◽

pp. 45-54 ◽

Cited By ~ 4

Author(s):

A. M. Oparaeke ◽

M. C. Dike ◽

C. I. Amatobi

Keyword(s):

Vigna Unguiculata ◽

Plant Extract ◽

Insect Pests ◽

Megalurothrips Sjostedti ◽

Flower Thrips ◽

Field Activity

Download Full-text

Exploiting Thrips Aggregation Pheromones to Develop a Lure-and-Kill Strategy for the Management of the Bean Flower Thrips

Agronomy ◽

10.3390/agronomy11071269 ◽

2021 ◽

Vol 11 (7) ◽

pp. 1269

Author(s):

David K. Mfuti ◽

Amanuel Tamiru ◽

William D. J. Kirk ◽

Adeyemi O. Akinyemi ◽

Heather Campbell ◽

...

Keyword(s):

Field Experiments ◽

Insect Pests ◽

Field Trials ◽

Aggregation Pheromones ◽

Megalurothrips Sjostedti ◽

Flower Thrips ◽

Antifungal Effects ◽

Field Efficacy ◽

Management Alternative ◽

Trap Catches

The potential of semiochemicals to lure insect pests to a trap where they can be killed with biopesticides has been demonstrated as an eco-friendly pest management alternative. In this study, we tested two recently characterized male-produced aggregation pheromones of the bean flower thrips Megalurothrips sjostedti (Trybom), namely (R)-lavandulyl 3-methylbutanoate (major) and (R)-lavandulol (minor), for their field efficacy. Moreover, compatibility of these pheromones and two other thrips attractants, Lurem-TR and neryl (S)-2-methylbutanoate, with the entomopathogenic fungus (EPF) Metarhizium anisopliae ICIPE 69 has been determined. Our study revealed that the M. sjostedti aggregation pheromones have dose-dependent antifungal effects on the EPF viability, but showed no fungistatic effect at a field-realistic dose for attraction of thrips. (R)-lavandulyl 3-methylbutanoate had similar antifungal effects as neryl (S)-2-methylbutanoate 8 days after exposure; whereas, Lurem-TR had a stronger antifungal effect than other thrips attractants. In the semi-field experiments, all autoinoculation devices maintained at least 86% viability of M. anisopliae conidia after 12 days of exposure. Field trials demonstrated for the first time that (R)-lavandulyl 3-methylbutanoate increases trap catches. Our findings pave a way for designing a lure-and-kill thrips management strategy to control bean flower thrips using autoinoculation devices or spot spray application.

Download Full-text