Cucumber (Cucumis sativus) lines showing resistance to Zucchini yellow mosaic virus (ZYMV) were selected. Two lines (temporarily designated SK-003 and SK-004) showed high resistance to ZYMV, but susceptibility to Papaya ringspot virus (PRSV). SK-003 and SK-004 exhibited a veinal chlorosis on the first and second true leaves when the cotyledon was inoculated with ZYMV. ZYMV was not detected on the fourth leaves, although it was detected from those below the third leaves. A field test confirmed that SK-003 and SK-004 were resistant to ZYMV under natural conditions.
Lisianthus (Eustoma grandiflorum) necrotic ring spot disease caused by Iris yellow spot virus (IYSV) is one of the most devastating lisianthus diseases. We tested several insecticides under both experimental and field condition to determine the length of the their residual activity in killing the thrips vector (Thrips tabaci) and their ability to inhibit IYSV transmission. The survival rate of T. tabaci was significantly low, and their ability to transmit IYSV was greatly inhibited after treatment with either acephate or spinosad under the experimental conditions. The insecticidal activity of acephate remained for at least 28 days, the longest duration of all examined insecticides. The number of thrips on lisianthus plants treated with acephate remained low until 17 days after treatment (DAT), while thrips density had increased by 10 DAT when thiamethoxam. These results indicated that acephate most effective controls the lisianthus necrotic ring spot disease.
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