Agriculture has always been affected by intractable pests. Conventional agriculture still relies on the use of several pesticides to control various pests to ensure the yield of the crop and to feed a constantly growing population. To reduce the pest menace, the fatuous behavior of people as well as a natural proclivity towards the use of pesticides in a non-judicious manner, has caused several ecological backlashes such as secondary pest outbreak, pest resurgence and non-target organism's exploitation. Effects of pesticides on non-target organisms area worldwide concern and contention are the basis for most legislation regarding usage of specific pesticides. Pesticides, besides their effect on pests, would also affect several beneficial non-targets. The effect of pesticides could be lethal and may prove catastrophic or sublethal and stimulate the growth and development of non targeted biota's. Hence, this review approaches well-analyzed hindsight regarding the effect of pesticides on the natural enemies as well as other non-target organisms present in the rice agroecosystem.
BACKGROUNDThe rice moth, Corcyra cephalonica (Stainton) (Lepidoptera: Pyralidae) is a pest of stored grains and widely used as a factitious host during the mass rearing of several natural enemies of crop pests. Hormesis is well‐documented in pest insects, to some extent in natural enemies of pests.RESULTSWe report transgenerational stimulatory effects of the widely used fumigant, phosphine. The study reports the consequences of sublethal, low lethal and median lethal concentrations (LC5, LC25 and LC50) and untreated control for two sequential generations of the species (G1 to G2). In this study, we investigated the life‐history traits, nutrient reserves (protein, lipid and carbohydrate) and larval gut microbiome (using 16 s rRNA V3–V4 metagenomics sequencing) of C. cephalonica. Stimulatory effects were observed for various biological traits of C. cephalonica, notably adult longevity, emergence and increased egg hatchability when exposed to LC5 of phosphine. The total protein, lipid and carbohydrate contents of C. cephalonica also were found to be significantly increased by LC5 in both generations. The microbial diversity of LC5 treated larval gut was higher and found to be different from the rest of the treatments. This is the first report showing hormesis to a fumigant insecticide.CONCLUSIONOur findings increase knowledge on the interaction between hormesis, nutrient reserves and gut bacteria in C. cephalonica exposed to insecticides. Overall, the present study establishes phosphine‐induced hormesis at LC5 in the host C. cephalonica, which might help improve the quality of mass rearing of various natural enemies. © 2023 Society of Chemical Industry.
The potential yield loss of 15-25% rice production is noticed due to different pest infestation in South Asian countries. This is due to the favorable climatic conditions for pests. It compels farmers to use a major chunk of pesticides to prevent/recover from pest attack. Hence, the field experiments were carried out to test the insecticide, Chlorantraniliprole 625 g/L FS as seed treatment formulation. It is evident from the studies undertaken during rabi 2018-19 and kharif 2018, that Chlorantraniliprole provided excellent control over yellow stem borer and leaf folder in conventional variety of rice (CR Dhan 304) and hybrid rice (28P67). Among the different doses, Chlorantraniliprole @ 75.0 g a.i/ha recorded significantly better control registering least dead heart of 5.41, 4.77, 3.43, 2.98% and 2.47% at 14, 21, 28, 35 and 42 days after transplanting, respectively. Similarly for Hybrid (28P67) trial the treatment recorded the least count of leaf folder with 0.57, 0.68, 0.74, 0.81 and 0.89 larvae/hill during the intervals of 14, 21, 28, 35 and 42 days after transplanting, respectively and the highest yield (5.46 t/ha) was registered in treatment which was significantly superior over the other entire dose rates of Chlorantraniliprole and the market standard. Thus, from this study, Chlorantraniliprole @ 75 g a.i /ha can be recommended for controlling stem borer and leaf folder in paddy (both for conventional variety and hybrid).
Dr. Soumia PS, Scientist, ICAR-Directorate of Onion and Garlic are duly acknowledged.
Laboratory studies were conducted to assess the repellant effects of three essential oils from plants viz., orange, eucalyptus and cinnamon oils against four major coleopteran stored grain insect pests of rice viz., Sitophilus oryzae, Oryzaephilus surinamensis, Rhyzopertha dominica, and Tribolium castaneum. The % repellency (PR) and index of repellency (RI) were observed to range from 10 to 100% and 0.00 to 0.90, respectively. Eucalyptus oil @ 5% showed maximum repellent action against Tribolium castaneum, registering PR and RI values of 93.33 (F=0.921), 100 (F=1.66), 100 (F=3.772) and 0.07, 0.00 and 0.00, respectively at 3, 6 and 12 hrs after treatment and were found significantly superior over rest of the treatments. Chemical profiling of tested oils through GCMS showed presence of 2- 3 chemical constituents amounting to >90 % of total composition of oil. The results highlight the repellency effects of the essential oils and indicate that these can be ecofriendly ones for the post-harvest protection of rice.
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