ABSTRACT. Behavioural habituation† of Schistocerca gregaria Forskål fifth instar larvae to a feeding deterrent, nicotine hydrogen tartrate (NHT), is described. An attempt was made differentiate between various factors possibly involved in the induction this behavioural habituation. Sensory stimulation (through maxillary palp), cannulation NHT into crop, and its administration by gelatine capsules placed oesophagus each resulted habituation, but latter two cases sole via post‐ingestional...

The examination of substrate selection for oviposition behaviour by specialist phytophagous insects like Acanthoscelides obtectus, Bruchus pisorum , and Pieris brassicae revealed that such processes were governed information probably obtained through similar receptors to those taking part in feeding preference or rejection. role the ovipositor is assumed be secondary negligible. respond a wide variety inorganic organic compounds very dissimilar structure which inhibit on most preferred host...

We have studied the relationship of bruchids and their legume hosts by extensive field sampling throughout Hungary over 17 years rearing beetles from samples in laboratory. The value system lies accuracy host affiliations. A total 138 species subspecies plants were sampled, representing approximately 87% Leguminosae Hungary. Only 51 (37.0%) harboured (12 Bruchus spp. 15 Bruchidius spp). Bruchids occurred 38.3% plant samples. Thirty‐seven congeneric with bruchid unoccupied bruchids. degree...

Abstract A short critical review is given on the literature of host plant finding in phytophagous insects with main emphasis Colorado potato beetle ( Leptinotarsa decemlineata Say, col.: Chrysomelidae). The data are compared results field experiments: (1) foraging behaviour adults was observed a arena bare ground, and (2) were released closed stands recaptured by potted plants. It concluded that chance event this species. high directionality move must be an adaptation increasing probability...

We measured and calculated seed morphological parameters [axonometric linear measures, weight, volume minimum-maximum size ratio (SMIMA)] of 110 leguminous plant species occurring in Hungary. collected samples, reared the predispersal predators from took data bruchids (elytra length, body width, thorax length) (BSR). found that SMIMA BSR were fairly good predictors bruchid infestation patterns at tribe, sample (locality) levels. Bruchid length was much less variable than (e.g., volume) seeds...

Abstract Visual responses of adult male and female Colorado potato beetles CPB, Leptinotarsa decemlineata (Say) (Coleoptera, Chrysomelidae) to 10 × 20 cm coloured paper‐boards, beetle‐sized beads or dead combinations these in laboratory experiments an arena 52 diameter were investigated. In addition, visual discriminatory abilities males exposed female‐specific substances also measured. The paths the recorded on videotape by a computer‐aided motion detection system. Parameters tracks...

Males and females of the dry bean weevil, Acanthoscelides obtectus deposit chemically unknown substance(s) on beans during various activities (most probably defecation), under laboratory conditions. The marking results in avoidance these by other for oviposition. Also, first‐instar larvae are influenced to disperse more deposited substance(s), so that they likely find unmarked enter. No specific behaviour adults was noted. That deterring might originate from microorganismic activity after...

Comparative studies of the oviposition behavior wild Caribbean fruit flies and a strain reared in laboratory for over 100 generations revealed significant differences their responses to certain physical characteristics site. In choice tests using white black artificial domes, selected domes almost exclusively, but laboratory‐reared (LR) failed show any preference. When given between flat substrates (both black), displayed an absolute preference whereas LR deposited nearly 12% eggs into...

The ovipositional responses of laboratory‐reared (LR) and wild Anastrepha suspensa (Loew) females were evaluated upon presentation selected chemical stimuli. Among these, sucrose several inorganic salts did not appear to influence strongly oviposition site acceptance by either LR or flies. Alkaline media rejected acidic preferred for both especially A diethyl ether surface rinse guava fruits ( Psidium guajava L.), a normal host plant, applied black paraffin domes failed promote A. due the...

Abstract The paper investigates the distributions of legumes (Fabaceae) and their associated seed beetle species (Bruchinae) across vegetation zones regions Europe evaluates host range specialization beetles. 1584 legume species/subspecies/varieties were included in study ca. 16% these serve as known hosts by 175 found Europe. Both plant richness increased from Boreal to Mediterranean zones/regions. 717 occurred only single zones/regions 4.7% (34 species) for 38 bruchine specific a...

The mechanisms of host shift in phytophagous insects are poorly understood. Among the many proposed processes involved, sexual selection via semiochemicals has recently been suggested. This hypothesizes that communication using pheromones is modified as a result development on new host, and such plant-induced phenotypic divergence mate recognition cues can lead to reproductive isolation between lines. We tested this hypothesis Acanthoscelides obtectus, an oligophagous bruchid Phaseolus...

Abstract Prereproductive adults of the grasshopper, Melanoplus sanguinipes (F.) (Orthoptera, Acrididae), demonstrated orientation and movement towards both visual olfactory stimulus sources in a still‐air chamber. Visual stimuli (wheat lima bean foliage, vertical black or yellow‐green stripes, broad leaf pattern) were approached more frequently than control white background surface. Olfactory (chopped wheat foliage four‐component, synthetic, ‘grass odor’ blend volatiles) elicited an even...

Abstract Bean weevil ( Acanthoscelides obtectus (Say)) females were found to use seeds (discrete resource patches) differentially when different sizes offered in multiple‐choice tests. Females, either as a group or individuals, laid significantly (two six times) more eggs on large than those of five times smaller mass. In contrast, seed shape (flattened spherical) did not contribute clutch‐size adjustment. Thus, A seem measure only relative size comparison is possible. Nevertheless, overload...

ify decomposition rates vital to nutrient cycles (Didham, 1998) and affect abundance community composition (Ewers

Abstract Some components of the food‐related behaviour (biting, feeding, walking on plant or elsewhere, and resting) two North American three European Colorado potato beetle (CPB) populations, six solanaceous species were monitored with help a microcomputer‐based program, testing hypothesis whether populations showed differences at behavioural level to alternative host plants ( S. melongena, dulcamara , Lycopersicon esculentum ), as well non‐host occasionally encountered luteum, nigrum )....

Abstract. 1. The variability of species combinations and membership assembly patterns in an insect pre‐dispersal seed predator guild were studied at various spatial temporal resolutions using presence/absence abundance data null models. consists seven beetle (four bruchids three curculionids) one moth that live on a perennial vetch, Vicia tenuifolia Roth (Leguminosae). 2. varied considerably the number members space time, and, contrary to expectations, there was no evidence interspecific...

Abstract: After comparing the persistence of four marking techniques, a mark–release–resight study was performed to characterize mid‐season movement Colorado potato beetle [ Leptinotarsa decemlineata (Say); Col., Chrysomelidae] simultaneously in fallow and wheat field. Isolated patches potatoes were installed random spatial arrangement on both fields similarly. Overwintered beetles individually marked released. Beetles showed limited inter‐patch activity (15.9% recovery events) with an...