The effect of potato leafroll virus on the biology of Myzus persicae

Abstract

Since potato leafroll virus multiplies in the green peach aphid, Myzus persicae, the effect of the virus on the biology of its vector was investigated. Observations were made regarding the longevity and the reproduction rate of viruliferous and non-viruliferous aphids on leafroll-diseased and healthy plants of Physalis floridana. The same matters were investigated for both viruliferous and non-viruliferous aphids on seedlings of Chinese cabbage (Brassica pekinensis). It was shown that on leafroll-diseased plants of P. floridana the aphids produced more progeny than on l~ealthy ones, although the average number of progeny produced per day in both cases was almost the same. On healthy Chinese cabbage seedlings there was no difference in average length of the larval and adult stages, number of progeny per aphid, and number of progeny per day, between viruliferous and non-viruliferous aphids. Evidence was obtained that the virus does not influence the development of its vector. Measurements of oxygen consumption of both viruliferous and non-viruliferous aphids point in the same direction.

The Role of Bacterial Chaperones in the Circulative Transmission of Plant Viruses by Insect Vectors

“…In many cases, this tissue is the phloem, but can also be the xylem. Injecting plant viruses occurs along with salivary secretions [22]. The insect’s saliva is composed of two salivary secretions: watery saliva and gelling saliva.…”

Changes in Green Peach Aphid Responses to Potato Leafroll Virus–Induced Volatiles Emitted During Disease Progression

“…The performance of M. persicae is enhanced on its host plants infected with PLRV compared with noninfected control plants (Janssen 1929, Ponsen 1969, Castle and Berger 1993, Srinivasan et al 2008, and the aphid preferentially settles on the PLRV-infected hosts (Castle et al 1998, Eigenbrode et al 2002, Srinivasan et al 2006. Volatile organic compounds (VOCs) in the headspace of PLRV-infected plants are at least partially responsible for these aphid responses (Eigenbrode et al 2002, Srinivasan et al 2006, Alvarez et al 2007, Ngumbi et al 2007.…”

The biological transmission of potato leafroll virus by Myzus persicae

“…During starvation at 4 ~ the larvae produced no honeydew ~md did not moult; notwithstanding the storage of the larvae at 4 ~ without food, they completed the larval stage in about 9-10 days when transferred to plants at 20~ Normally at this temperature the aphid completed the larval stage in 9-10 days (Ponsen, 1969). …”

“…The same PLRV isolate was used as in earlier experiments (Ponsen, 1969). It was maintained in P. floridana, which was used as both source and test plant in all experiments.…”

“…After 10 days the plants were examined daily for the presence of progeny and all young aphids were removed. The individually caged plants were kept in a cabinet at 20 ~ (Ponsen, 1969). The aphids spent their whole life on the same cabbage plants.…”