Abstract
Nutrient composition, secondary plant substances and other host quality characteristics govern resistance and influence herbivore feeding. The current study was carried out to compare aspects of feeding behaviour and food utilization of banana weevil (Germar) (Coleptera: Curculionidae) larvae feeding on banana cultivars with different levels of resistance. In the first study, penetration times of larvae into tissue of seven banana cultivars (two susceptible, three intermediate and four resistant) were compared. Day-old larvae were placed on corm or pseudostem tissue of these cultivars and time taken to penetrate the tissue was recorded. Larvae generally took longer to tunnel into resistant cultivars, although Yangambi Km5 (resistant) did not fit this pattern. In the second set of studies, food consumption and growth of larvae were compared on cultivars: (i) Kisubi (resistant) vs. Atwalira (susceptible); and (ii) Mbwazirume (intermediate) vs. Kayinja (resistant). Day-old larvae were offered weighed pieces of corm that were changed every 4–7 days. At each corm change, weights of the larvae, corms and frass were measured. Changes in corm and larval weight were calculated to determine larval growth and amount of tissue consumed. Larvae feeding on resistant cultivars had lower consumption and growth rates and longer developmental duration. It was concluded that low food consumption rates contribute to delayed development of larvae feeding on resistant cultivars. Differences between resistant and susceptible cultivars in food utilization may be of limited consequence for the cultivars tested. This is one step in identifying the factors influencing weevil development rates in cultivars of different resistance levels. If these factors are identified, they can be targeted in breeding for resistance.
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Claims 6
Claim · model-written summary
Larvae generally took longer to tunnel into resistant banana cultivars
- Taxon
- bananat0
- Material
- resistant cultivarse0
- Interactor
- Cosmopolites sordidus
Cosmopolites sordidust0pest - Outcome
- took longer to tunnel intoe0
- Direction
- longere0
- Qualifier
- Yangambi Km5 (resistant) did not fit this patterne0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e0“Larvae generally took longer to tunnel into resistant cultivars, although Yangambi Km5 (resistant) did not fit this pattern”
Claim · model-written summary
Larvae feeding on resistant banana cultivars had lower consumption and growth rates
- Taxon
- bananat0
- Treatment
- feeding on resistant cultivarse1
- Interactor
- Cosmopolites sordidusCosmopolites sordidust0pest
- Outcome
- consumption and growth ratese1
- Direction
- lowere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e1“Larvae feeding on resistant cultivars had lower consumption and growth rates and longer developmental duration”
Claim · model-written summary
Larvae feeding on resistant banana cultivars had longer developmental duration
- Taxon
- bananat0
- Treatment
- feeding on resistant cultivarse1
- Interactor
- Cosmopolites sordidusCosmopolites sordidust0pest
- Outcome
- developmental duratione1
- Direction
- longere1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e1“Larvae feeding on resistant cultivars had lower consumption and growth rates and longer developmental duration”
Claim · model-written summary
Low food consumption rates contribute to delayed development of larvae on resistant banana cultivars
- Taxon
- bananat0
- Interactor
- Cosmopolites sordidusCosmopolites sordidust0pest
- Outcome
- delayed development of larvaee2
- Qualifier
- low food consumption ratese2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e2“It was concluded that low food consumption rates contribute to delayed development of larvae feeding on resistant cultivars”
Claim · model-written summary
Differences in food utilization between resistant and susceptible banana cultivars may be of limited consequence
- Taxon
- bananat0
- Treatment
- resistant and susceptible cultivarse3
- Outcome
- food utilizatione3
- Qualifier
- of limited consequence for the cultivars testede3
Not reportedDirection
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e3“Differences between resistant and susceptible cultivars in food utilization may be of limited consequence for the cultivars tested”
Claim · model-written summary
Factors identified in this work could be targeted in breeding banana for resistance to the weevil
Verbatim
t0“banana weevil (Cosmopolites sordidus) larvae on banana cultivars”
e4“If these factors are identified, they can be targeted in breeding for resistance”
The same questions in other papers
infection · Cosmopolites sordidus · MusaResults agree
1 paper in the same direction as this paper
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.