Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 2. Designing a reliable laboratory test for resistance based on aspects of the host-parasite relationship

Resistance of Cucumis sativus L. to Tetranychus urticae Koch. 6. Comparison of near isogenic bitter and non-bitter varieties for resistance

“…The damage index of the practical test is, however, the resultant of all possible parameters and did not demonstrate substantial differences between near isogenic bitter and nonbitter varieties. Earlier studies (DE PONTI, 1977) indicated a correlation between oviposition and the survival of juvenile stages. Nevertheless, it may be worthwhile to investigate the juvenile survivorship on the near isogenic ILG varieties.…”

“…In the laboratory test (DE PONTI, 1977) 20 female deutonymphs'were placed on the first true leaf. After 10 days the mites that remained were counted as a measure of acceptance.…”

Resistance in Cucumis sativus L. to Tetranychus urticae Koch. 3. Search for sources of resistance

“…Because the differences in oviposition were not significant, the laboratory test was extended to measure preadult mortality, so that net reproduction (see DE PONTI, 1977b) was also determined. As far as tested, the species differ from the susceptible control for acceptance and net reproduction, but not for the damage index scored in the practical test.…”

“…The varieties which were least damaged in the previous test (class 1 and 2), together with the twelve varieties selected by KOOISTRA (1971), were subjected to a laboratory test to determine acceptance and reproduction as parameters of resistance. A technical description of this test is contained in an earlier publication (DE PONTI, 1977b). Ten plants randomized on an individual plant basis in climate rooms, were tested per variety.…”

Resistance to the two-spotted spider mite, Tetranychus urticae (Koch), in New Guinea Impatiens

“…Ponti (1977) used the term "nonacceptance" instead of the terra "nonpreference". He indicated that during the orientation phase of an insect, a plant is rejected as a host regardless of whether it is offered singly or together with other plants.…”