ASPECTS OF THE ECOLOGY OF APPLE LEAF ROLLERS (LEPIDOPTERA: TORTRICIDAE) IN THE OKANAGAN VALLEY, BRITISH COLUMBIA

1974 ◽  
Vol 106 (4) ◽  
pp. 349-352 ◽  
Author(s):  
D. F. Mayer ◽  
B. P. Beirne
Keyword(s):  
British Columbia ◽  
Water Balance ◽  
Larval Dispersal ◽  
Host Plants ◽  
Environmental Water ◽  
Vehicular Traffic ◽  
Alternative Host ◽  
Leaf Roller ◽  
Okanagan Valley

AbstractPopulations of leaf rollers on apple can be influenced by the proximity of alternative host plants, notably rose, privet, and antelope bush, in part because larval dispersal is common. Indications are that leaf roller population increases caused by parasite decreases are ultimate consequences of pesticide treatments, so that reductions in spray programs will not necessarily cause potential leaf roller pests to become actual pests. The composition of the leaf roller fauna on apple m the Okanagan Valley becomes increasingly complex as the environmental water balance is changed by cultivation and irrigation. There are indications that heavy vehicular traffic can be harmful to leaf rollers and their parasites nearby.

scholarly journals How much does the host matter to the parasitoid? Distribution of Eurytoma (Hymenoptera, Chalcidoidea) species amongst two locally co-occurring gall-inducing hosts in the genus Diplolepis (Hymenoptera, Cynipidae)

2020 ◽  
Vol 152 (6) ◽  
pp. 815-822
Author(s):  
Jamie M. MacEwen ◽  
Nathan G. Earley ◽  
Robert G. Lalonde
Keyword(s):  
United States ◽  
British Columbia ◽  
Cytochrome B ◽  
Host Plants ◽  
Growing Season ◽  
Sampling Location ◽  
The North ◽  
Gall Wasps ◽  
North End ◽  
Okanagan Valley

AbstractGall wasps in the cynipid genus Diplolepis Geoffroy (Hymenoptera: Cynipidae) attack various species of native and introduced roses in Canada. Although gall forms are diverse, gall wasps are parasitised by highly concordant complexes of parasitoids and inquilines. Many species of gall wasps attack the same host plants and develop over the same periods in the season, suggesting that opportunistic parasitoids may be exploiting a range of hosts rather than specialising. We sampled larvae of Eurytoma Illiger (Hymenoptera: Cynipidae) from galls of D. variabilis (Bassett) and D. rosaefolii (Cockerell), gall inducers that develop fairly synchronously late in the growing season on leaves of Rosa woodsii Lindl. (Rosaceae) in the Okanagan Valley of central British Columbia, Canada. Galls were sampled at five different sites along a gradient from the north end of the valley to the Canada–United States border, a distance of 100 km. We extracted DNA, then amplified and sequenced the cytochrome b segment for each Eurytoma larva. We identified two well-supported clades that were differentiated by neither sampling location nor host. Instead, at least two species of Eurytoma, E. imminuta Bugbee and E. longavena Bugbee, exist at these localities, and both exploit at least two of the Diplolepis hosts found at these sites.

Monitoring of Drosophila suzukii (Diptera: Drosophilidae) in Okanagan Valley vineyards, British Columbia, Canada, and assessment of damage to table and wine grapes (Vitaceae)

2020 ◽  
Vol 152 (4) ◽  
pp. 415-431
Author(s):  
Susanna Acheampong ◽  
Etienne Lord ◽  
D. Thomas Lowery
Keyword(s):  
British Columbia ◽  
Weather Conditions ◽  
Wine Grape ◽  
Drosophila Suzukii ◽  
Wine Grapes ◽  
Apple Cider ◽  
Table Grapes ◽  
Soft Fruit ◽  
Grape Cultivars ◽  
Okanagan Valley

AbstractSpotted-wing drosophila, Drosophila suzukii, (Matsumura) (Diptera: Drosophilidae), has become a serious pest of soft fruit in the Okanagan Valley of British Columbia, Canada since its detection in 2009. The study was conducted to determine the distribution of D. suzukii and damage levels in grapes. Apple cider vinegar-baited traps placed in table and wine grape (Vitis vinifera Linnaeus; Vitaceae) vineyards during 2011–2013 demonstrated that D. suzukii was numerous in all sites, with earliest emergence and highest numbers recorded in 2013. Drosophila suzukii were reared from intact and damaged table grapes and damaged wine grapes collected from the field, but not from intact wine grapes. Drosophila suzukii were reared in low numbers in 2011 from intact fruit of 11 wine grape cultivars exposed artificially in the laboratory. Susceptibility of intact wine grapes under laboratory conditions in 2011 when sour rot was widespread might relate in part to undetected infections of berries due to weather conditions. Identification of Drosophila Fallén species revealed that D. suzukii comprised a small portion of the total. Our results demonstrate that healthy wine grapes in the Okanagan Valley of British Columbia are largely undamaged by D. suzukii, while certain table grape cultivars should be protected from attack.

African cassava mosaic virus (African cassava mosaic).

2021 ◽  
Author(s):  
Olufemi Joseph Alabi ◽  
Rabson M. Mulenga
Keyword(s):  
Feeding Behaviour ◽  
Host Plants ◽  
Yield Loss ◽  
Infection Type ◽  
African Cassava Mosaic Virus ◽  
Alternative Host ◽  
Cotton Species ◽  
New Localities ◽  
Whitefly Vector ◽  
Cassava Mosaic Virus

Abstract Cassava is vegetatively propagated therefore ACMV and other CMGs are primarily transmitted via movement of contaminated cuttings. Consequently, introductions of specific CMGs into new localities mirror patterns of cassava cuttings exchange among farmers. Once infected cuttings are planted, the virus establishes easily and can be transmitted within and between fields through the feeding behaviour of the whitefly vector, Bemisia tabaci. ACMV is particularly invasive in that it is the most widespread of all known CMGs, occurring across all cassava-producing countries of Africa in cassava and several alternative host plants (Thottappilly et al., 2003; Alabi et al. 2015). ACMV has also been reported infecting non-cultivated exotic cotton species in Pakistan (Nawaz-Ul-Rehman et al., 2012) further underscoring its invasive nature. Yield loss due to CMD can range from 12 to 82%, depending on the cassava variety and infection type (Owor et al., 2004). ACMV is not on the IUCN or ISSG alert list.

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