جستجوی مقالات مرتبط با کلیدواژه "aculops lycopersici" در نشریات گروه "گیاهپزشکی"

Feeding Aculops lycopersici (tomato russet mite) on tomato leaves and stems change color to fawn color, plant dryness and fruits nars of infested plants. An investigation carried out with three botanical pesticides, i.e. GC–mite (1ml/l), Biomite (2 ml/l), Neem 1.8 EC (3ml/l) and 25% lower than – recommended doses in compared with 0.5ml/l dose of Bifenazate 24% SC, Cyflumetofen 20% SC, Spirodiclofen 24% SC, Spiromesifen 24% SC, 0.75 ml/l of Milbemectin 1% EC on tomato under field and greenhouse conditions in Tehran and Varamin, respectively. A completely randomized design and randomized complete block design used in greenhouse and the field with three replications. Water sprayed in control treatment. Effects of each treatment determined by random 30 tomato leaves collected at one day before and 3, 7 and 15 days after treatments. Active mite stages on lower surface of tomato leaf counted and collected data by Abbott and Henderson–tilton formulas in greenhouse and field converted to mortality percentage, respectively. Mean mite mortality percentage analysis showed a significant (p<0.05) for 3rd day interval only under greenhouse and minimum 94.70 % control received among treatments at 15th day of sampling. While least of mean of mite control among treatments after 15 days under field condition recorded 89%. Mite mortality percentage found significant (p<0.05) between 3rd and 15th days sampling time among treatments under field conditions. Higher effects of botanical recorded 92.39% for 0.75 ml/l GC–mite, Biomite (93.23, 97.22%), Neem (97.11, 95.15%) doses, respectively. Least of mite pest controlled recorded 80.98% by spirodiclofen among synthetic acaricidal under field conditions. This finding suggested that through application of botanical pesticides in rotation with other pesticides, tomato production and natural enemies almost remained safe under field conditions.

Aculops lycopersici (TRM) is an important tomato crop pest. Bioassay on registered doses of 0.75, 1.5, 2.5 ppm of GC-mite, Biomite, and Neem EC 1.8% botanical pesticides were conducted in laboratory respectively. One liter stock solution of each pesticide was used to prepare different doses (0.1-0.9 ppm) and bioassay was conducted using tomato infested leaf submerged for 5 seconds with 10 replications. Distilled water was used in control treatment. Mortality of Aculops lycopersici was determined after 24 hours for each dose on TRM and analysis was done by POLO-PC software. According to LC50 determined, minimum dose toxicity recorded was 0.22 ppm for GC-mite which shows 71% reduction compared with the registered dose. Least dose slop recorded was 1.15±0.17 for 1.79 ppm of Neem. Effective dose of each treatment was compared with 20% lower and higher than the dose obtained when 10 TRM were observed in 1cm2 in middle part of lower and upper tomato leaf in the greenhouse. Live TRM population was counted by random collection of 12 leaves from each treatment and moving mites were counted in 1cm2 area on both the sides of leaf one day before and 3,7,14 days after treatment with stereo microscope. Highest mean of mite density recorded was 100.33±17.86 in 1 cm2 on the lower side of the leaf which was two times of the upper side of the leaf. Mean percent mortality on the 3rd day showed significant differences among the treatments although the effect of the treatments at 7th and 14th day caused 83.12% to 99.75% mortality and was not significantly different (p<0.05) except for biomite treatment. The results show that all the doses effectively controlled active TRM and can be substituted with the hazardous acaricides for production of organic tomato under greenhouse conditions.