This review has been suggested by the Scientific Committee of In­ ternational Biological Programme as part a project on population dy­ namics and biological control Myzus persicae. In order to contain this within reasonable number pages, information transmission virus diseases is virtually omitted; it could easily form equal length. Work other aphids which relevant ecology M. persi­ cae included in sections where knowledge persicae lacking or inadequate. A few insect species seem very well...

Abstract The host preference behaviour of the generalist aphid parasitoid Aphidius colemani was investigated using a Y‐tube olfactometer. Female A. showed for host‐plant complex on which they had been reared, even though same involved, demonstrating plant preference. This not evident when parasitoids were dissected from their mummies prior to adult emergence. Host exhibited during selection appeared be induced by chemical cues encountered mummy case at time emergence, but preferences could...

Although the insect circulatory system is involved in a multitude of vital physiological processes, it has gone grossly understudied. This review highlights this critical by detailing structure and function ...Read More

A review is presented of the principal arthropod pests pulse crops in tropics. The are grouped taxonomically but discussed roughly order which they colonise a crop. Pests stored legumes not dealt with, even though some cases infestation begins field. Information on distribution, damage, life-cycle and control leafhoppers, aphids, beanflies, beetles, Lepidoptera, thrips pod-sucking Hemiptera. Future strategies for pest

Brevicoryne brassicae and Myzus persicae were caged on the mature leaves of brussels sprout plants receiving different amounts nitrogen potassium. An increase in N or decrease K resulted an soluble levels leaves. The fecundity reproductive rate M. correlated with these changes; B. showed a markedly lower response to nutrient treatments. possible relationships results other contrasts between two aphids are discussed. Zusammenfassung UNTERSUCHUNGEN ÜBER DIE BEZIEHUNGEN ZWISCHEN INSEKT UND...

With increasing plant age, total soluble nitrogen of Brussels sprout plants decreased after a peak at 6–9 weeks. The then became less suitable for Brevicoryne brassicae and Myzus persicae (particularly the latter) as shown by estimates mean relative growth rate (RGR) aphids in two experiments. This statistic was, however, only poorly correlated with N this lack correlation was particularly marked on than 9 weeks old. Multiple regression leaf amino acid spectrum indicated that much...

Wide variations in total soluble nitrogen occurred different leaves of Brussels sprout plants. These were partly the result leaf age (leaf position) and fertiliser application to The fecundity Brevicoryne brassicae Myzus persicae caged on such also varied greatly was correlated with within same age, but not between ages. value concentrations, based analysis tissue, for indicating plant suitability aphids is discussed as well difference response two aphid species experimental conditions...

Abstract. Adult female parasitoids (Aphidius rhopalosiphi De Stef.) (Hymenoptera: Aphidiidae) reared on the aphid Metopolophium dirhodum (Walk.) (Homoptera: Aphididae) changed their responses to odours of two wheat cultivars (‘Maris Huntsman’ and ‘Rapier’) when parasitized aphids had been moved from former latter cultivar at various times after parasitization. If were less than 6 days, emerging mummies by then formed ‘Rapier’ responded positively that cultivar, whereas transferred as still...

Azadirachtin is the most effective compound of neem tree, Azadirachta indica A. Juss, with insecticidal and growth disruption properties on several species insects. Its effects development survival Spodoptora littoralis (Boisduval) were studied under laboratory conditions. Third-instar larvae individually fed artificial diet treated azadirachtin (from 0.01 ppm to 1 wt/v), for two days, transferred plain diet. Survival, duration stages deformities recorded daily. In a second experiment, 3rd...

Myzus persicae showed a reduced relative growth rate on plants given soil drenches of 1% CCC (a plant retardant), and greater reduction when was applied as foliar spray. The use the aphids convenient measure their performance in relation to resistance is discussed. ZUSAMMENFASSUNG RESISTENZ VON PFLANZEN GEGENÜBER MYZUS PERSICAE, DIE DURCH EINEN REGULATOR DES PFLANZENWACHSTUMS INDUZIERT UND AN DER RELATIVEN WACHSTUMSRATE GEMESSEN WURDE Die Resistenz von Kohlpflanzen, die mit (einem Regulator...

Abstract. In Y‐tube olfactometer tests, Aphidius ervi Hal., Trioxys sp., Praon Aphelinus flavus (Nees), Lysiphlebus fabarum (Marsh.) and rophalosiphi De Stef. responded positively to the odour of plant on which aphid mummies containing them had been collected. The response host was greater than aphids, their honeydew or a combination two. strongest aphids. A. rhopalosiphi showed strong positive three wheat volatiles (cis‐3‐hexenyl acetate, cis‐3‐hexen‐1‐ol trans‐2‐hexenal) as well...

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The hypothesis that plants supplied with organic fertilizers are better defended against insect herbivores than those synthetic was tested over two field seasons. Organic and fertilizer treatments at nitrogen concentrations were to Brassica plants, their effects on the abundance of herbivore species plant chemistry assessed. also differed in type: a green manure used for low-nitrogen treatment, while high-nitrogen treatment contained animal manures. Two aphid showed different responses...