| Abstract: In order to effectively prevent and control the Frankliniella occidentalis, a systematic experimental study was conducted on the selectivity of Frankliniella occidentalis to different host vegetables and their different parts of leaves. The tissue culture method and covering method were used to study the selectivity of Frankliniella occidentalis
to different host vegetables (cucumber, pepper, eggplant, cowpea, tomato, celery and cabbage) and their different parts of leaves. The results showed that in the non-selective experimental group, the numbers of adult insects on the middle leaves of tomato, cucumber, cabbage and cowpea were the highest with 14.33, 10.33, 10.80, 10.00 heads, respectively. On pepper, celery and eggplant, the hatching numbers of nymphs were relatively highest on the middle leaves with 0.33, 0.20, 1.80 heads, respectively. In the selective experimental group, the numbers of adult insects on the upper leaves of tomato, celery, cucumber and eggplant were the highest with 6.20, 2.40, 10.00, 4.40 heads, respectively. On cabbage, eggplant, cucumber and cowpea, the hatching numbers of nymphs were the highest on the middle leaves with 8.40, 4.00, 1.80, 1.20 heads, respectively. In the tissue culture method, the number of adult insects on cucumber was the highest (17.17 heads), followed by eggplant (4.17 heads) and celery (2.00 heads), cabbage (2.00 heads), pepper (1.83 heads) and tomato (1.83 heads) were relatively few. The hatching number of nymphs was highest on eggplant (33.67 heads), followed by cucumber, cabbage and tomato, and relatively lowest on celery and pepper. In the covering method, the order of the number of adult insects from high to low was eggplant (4.28 heads), cucumber (4.25 heads), tomato (2.12 heads), cabbage (1.72 heads), pepper(1.35 heads) and celery (0.78 head). The order of nymph hatching from high to low
was eggplant (33.67 heads), cucumber (14.50 heads) and tomato (0.83 heads), while there was no nymph hatching on pepper, cabbage and celery. Comprehensive studies had shown that adult and nymph of Frankliniella occidentalis had stronger preferences for cucumber and eggplant, followed by tomato, cabbage, pepper and celery, and they prioritized feeding and laying eggs on the upper and middle leaves of their host vegetables. |