Population densities of two- spotted spider mite on kidney bean under additive intercropping System
Paper ID : 1050-IPCA4
Hossein Madadi *1, Vahab Rahimi2
1Department of Plant Protection, Faculty of Agriculture, Bu-Ali Sina University
2Department of Plant Protection, Faculty of Agriculture, Bu-Ali Sina University, Iran
The intercropping or multiple cropping practices defined as simultaneous cultivating two or more crops together at the same time within a field, has been considered as a primary method of agriculture among indigenous peoples in the world for centuries. Intercropping systems provide an option for insect control for organic farmers who can not afford chemical sprayings costs and as a cost-effective insect control solution. This study was done to evaluate the density of the mobile stages of Tetranychus urticae Koch on kidney bean (Phaseolus vulgaris L.) when intercropped with aromatic plants. The experiment was carried out in a randomized complete blocks design (RCBD) with five treatments and three replications in the 2020 agricultural season. The treatments included kidney bean pure crop, (100+50) kidney bean+Coriander (Coriander sativum L.), (100+50) kidney bean+ajwain (Carum copticum L.), (100+50) kidney bean+basil (Ocimum basilicum L.), and (100+50) kidney bean+Dill (Anethum graveolens L.). The dependent variables studied were mobile stages (immatures and adults) of two-spotted spider mite (TSSM), number of pods per plant (NPP), number of seed per pod (NSP), thousand-grain weight (TGW), and grain yield (GY) of kidney bean. There were six sampling dates on a weekly basis and in each sampling date, kidney bean leaves were collected and the number of TSSM immatures and adults were recorded. Analysis of variance showed that the TSSM population (immatures and adults) is significantly influenced by the intercropping system. Mean comparison revealed that the mininum value of immatures (4.103) was recorded in (100:50) kidney bean+basil and the minimum densities of T. urticae adults found in (100:50) kidney bean+basil and (100:50) kidney bean+Dill treatments (1.11 and 1.47 respectively). Although, the highest number of immatures and adults were observed in pure kidney bean treatment. The correlation test showed a significant negative relationship between the premature population of TSSM and some yield components such as NPP, TGW, and GY however, this relationship for NSP was non-significant. Accordingly, the lowest number of TSSM stages (immature and adults) and the highest yield (2756 kg/ ha-1) recorded in (100:50) kidney bean+basil treatment. Finally, intercropping kidney beans with some aromatic plants proved to be an eco-friendly strategy for TSSM control and is a good piece of the integrated pest management (IPM) puzzle.
Polyculture, IPM, Agricultural practice, multiple cropping, Aromatic plants, Tetranychus urticae
Status : Abstract Accepted (Poster Presentation)