The Effect of Ten Plant Powders on Lesser Grain Borer, Rhizopertha dominica During Different Storage Periods

A study examined three concentrations (2.0, 4.0, and 6.0g plant powder/10g wheat grain) of ten plant powders Anise, Pimpinella anisum, Black pepper, Piper nigrum, Ginger, Zingiber officinale, lamb’s ear, Stachys byzantine and Red pepper, Capsicum annuum. Coriander, Coriandrum sativum Fenugreek, Trigonella foenum, Cumin, Cuminum cyminum. Cinnamon, Cinnamomum cassi and Turmeric, Curcuma longa on the lesser. Grain borer, Rhyzopertha dominica, larvae and adults, the percentage of wheat grain weight losses during 1,2, and 3 storage months. The results of the study showed that the highest rate of larvae was 35.25 larvae for fenugreek plant, while the number of larvae limited to 3.80 larvae, for black pepper after one month of storage. Thus, the results also showed that the highest rate of Lesser grain borer adult number is 45.25 adults, was recorded for Fenugreek plant after 3 months of storage, while the lowest rate of adult number is 4.75 adults, was recorded for black pepper plant after one month of storage. Thus, the results also indicated that the concentrations of powders have a large and clear effect on the insect. The highest rate of larvae number is 18.46 larvae at 2.0 g/100 gm concentration, while the lowest rate of larvae is 3.60 larvae was recorded for a concentration of 6.0 g/100 gm seeds. The results also showed that the highest rate of the insect adult number is, 29.23 adults was recorded for a concentration of 2 g/10g grains, after 3 storage months, while the lowest rate of adult is 4.63 adults recorded for a concentration of 6.0 gm/10 gm seeds. The results also showed that the highest rate of grain losses is 5.59 grams, recorded for Coriander plant after 3 months of storage, while the lowest rate of grain weight losses, 0.69 g, was recorded for black pepper powder after 1 month of storage.