Effect of intercropping carrot (Daucus carota L.) with two aromatic plants, coriander (Coriandrum sativum L.) and summer savory (Satureja hortensis L.), on the population density of select carrot pests

Abstract

Intercropping, or the use of different aspects of the interaction between organisms in ecosystems, can be classified as an ecological method that limits harmful human interference in the environment, especially the consumption of chemicals. The impact of intercropping carrot with coriander Coriandrum sativum L. and summer savory Satureja hortensis L. on the occurrence of select carrot pests was estimated in the years 2010-2011. Intercropping had a significant effect on the decrease of the number of roots damaged by carrot rust fly Psila rosae. During harvest, the least number of damaged roots was observed in combination with summer savory S. hortensis L. The number of carrot psyllid Trioza viridula Zett. and aphids on carrot leaves and roots damaged by nematodes was significantly lower on plots where carrot was intercropped. Intercropping both herbs had a positive influence on the number of beneficial insects. In all of the years of the study, the highest number of Coccinellidae and Syrphidae were observed on plots where carrot was intercropped with coriander.

Cascading effects of combining synthetic herbivore‐induced plant volatiles with companion plants to manipulate natural enemies in an agro‐ecosystem

“…Another study showed that intercropping carrot with coriander increased syrphid abundance compared with carrot alone. 48 Ladybeetle abundance was also higher in bean plots intercropped with coriander. Previous studies showed that coriander plants intercropped with carrot, 48 tomato, 34 cabbage, 33 and eggplant 49 had higher abundance and diversity of coccinellids species than their respective monocrops, likely as a result of the attractiveness, and suitability as food, of coriander flowers for adult ladybeetles.…”

“…Morris and Li also found that coriander used as a companion plant together with cabbage attracted large numbers of syrphid flies. Another study showed that intercropping carrot with coriander increased syrphid abundance compared with carrot alone . Ladybeetle abundance was also higher in bean plots intercropped with coriander.…”

“…Ladybeetle abundance was also higher in bean plots intercropped with coriander. Previous studies showed that coriander plants intercropped with carrot, tomato, cabbage, and eggplant had higher abundance and diversity of coccinellids species than their respective monocrops, likely as a result of the attractiveness, and suitability as food, of coriander flowers for adult ladybeetles. Coccinellids also have an innate attraction to volatiles from coriander at the vegetative stage .…”

“…Coriander, Coriandrum sativum cv. ‘Verdão’, was used as a companion plant because previous studies have shown that coriander when intercropped with cabbage, tomato, carrot, eggplant, and rose plants attracts natural enemies – for example, lacewings (Chrysopidae), hoverflies (Syrphidae), and ladybeetles (Coccinellidae). Coriander emits volatiles throughout all vegetative stages, which are known to be attractive to natural enemies .…”

Dynamics and pest and natural enemies dispersion in cowpea and colored cotton in sole or intercropping systems

“…As in intercropping systems, two or more crops can be planted in the same area (Tung et al 2016), maintaining the biodiversity of floral and feeding resources for natural enemies, thus contributing to the reduction of pest population in cotton (Fernandes et al 2012;Rao et al 2012), causing impact on insect dynamics in intercropping systems (Altieri & Letourneau 1982). Several studies have shown that agroecosystem diversification can reduce pest infestation (Jankowska & Wojciechowicz-Żytko 2016). The understanding of diversity plant effect on herbivorous control is relevant for the understanding of agricultural sustainability (Dassou & Tixier 2016).…”