Peach aphid

Rodriguez, A. E., Tingey, W. M. and Mutschler, M. A. 1993. Acylsugars of Lycopersicon pennellii deter settling and feeding of the green peach aphid (Homoptera Aphidae). J. Econ. Entomol. 86 34-49. 

By the beginning of the 1990s, houseflies, Colorado potato beetles, cockroaches, peach aphids, cabbage moths and several other insect species became insensitive to all the insecticides used. 

Analyses of the volatiles released by females of the peach aphid Tube-rocephalus momonis showed two sex pheromone components that were identified as (4a5,75,7ai )-nepetalactone and (4a5,75, 7ai )-nepetalactol, in a ratio of 4 1. The most effective blend for trapping males was found to be 85 15 nepetalactone to nepetalactol respectively. In addition to T. momonis, over 20 other species of aphids were also caught. 

Cuticular diterpenes-duvanes and labdanes. Cutler have found that the cuticular diterpenes of green tobacco have both allelopathic and insect-deterrent effects (38). Present in the cuticle are duvane and/or labdane diterpenes (Figure 3) The levels of these specific cuticular components are believed to be responsible for the observed resistance of some types of tobacco to green peach aphids Myzus persicae (Sulzer), tobacco budworm Heliothis virescens (F.), and tobacco hornworm Manduca sexta (L.) (39). 

Brussels Sprout Pea Aphid Green Peach Aphid [Pg.155]

Other benefits of large numbers of analogs to plants may include slower evolution of tolerance or lower rates of metabolism of mixtures compared with that of single compounds in herbivorous insects. Feng and Isman (1995) investigated the possibility of adaptation in herbivores by repeated selection of peach aphid colonies with either pure azadirachtin or neem seed extracts containing a large number of limonoids. The colonies treated with azadirachtin soon showed evidence of tolerance of this pure compound, whereas no evidence of tolerance was... 

Feng, R. and Isman, M. B. (1995). Selection for resistance in green peach aphid. Experientia 51 831-833. 

Green Peach Aphid Wash. House Mosquito Cameroon... 

Pirimicarb is a selective aphicide against organophosphate-resistant green peach aphids on a wide variety of crops including cereals, fruits, potatoes, sugar beets, and vegetables. It kills insects by contact, translaminar, systemic action, and vapor. Its oral LD50 in rats is 147 mg/kg. 

Table 10.6 Resistance, esterase activity, and paraoxon degradation for several strains of green peach aphid...

Aphid parasites Aphidius matricariae, Lysiphlebus testaceipes, other species Apple aphids, green peach aphids, melon aphids, others. Release 50-100 pupae of these parasitic wasps in a garden or small greenhouse early in spring. Experimental best effect if used with aphid predators. 

Peach aphids, green, 269,419 Peach leaf curl, 344,383 bordeaux mix for, 467 copper for, 471 peach and, 165,167,383 Peach rosette, 168,394,394 Peach scab,165,166 Peachtree borers, 313.313 apricot and, 27 cherry and, 69 peach and, 165, 168 pheromone traps for, 437 Peach twig borers almond and, 17 apricot and, 26 peach and, 165, 166-67 Pear, 168-71... 

Hydrolysis. Carboxylesterases are frequently one of the major factors in OP resistance. In some insects, for instance the house fly (28), there are highly substrate specific esterases which attack only one or a very few molecules. "Malathionase", the prominent esterase responsible for many cases of malathion resistance, is highly specific for malathion. It cleaves one or both of the ethyl ester groups leaving malathion mono- or diacid (29). This enzyme is a true serine carboxylesterase that is inhibited by malaoxon (28) and does not hydrolyze any of the phosphoester bonds. In Anopheles stephensi from Pakistan, the malathion resistance decreased with adult age, but there was no concommittant decrease in general esterase activity as measured with 1- and 2-naphthylace-tate as model substrates (301. other mosquitoes have a carboxylesterase with broad substrate specificity that is associated with resistance (31-331. As mentioned above, the green peach aphid has a carboxylesterase, E4, with broad substrate specificity that sequesters toxicants (24). 

Green peach aphid carboxylester hydrolase 0.256s (24)... 

Glandular trichomes of j>. berthaultii provide the greatest levels of resistance against immature life stages of pest species. Encasement of feet and mouthparts of the green peach aphid by trichome exudate is greatest on nymphs and least on adult aphids, parallelling the trends in mortality (6). 

The effects of sesquiterpene mixtures from leaf extracts of wild and cultivated potatoes on the settling behavior of green peach aphid were studied in dual-choice assays (22). The sesquiterpene fraction of JS. berthaultii had a strong repellent effect on aphid behavior. Due to use of the slow release medium Carboset, this effect was still apparent beyond six hours. The sesquiterpenoid fraction from cv. Chippewa leaves also strongly repelled aphids. The major foliar sesquiterpene in all extracts, B-caryophyllene, had no adverse effect on settling behavior. 

Adult grass grubs (Costelytra zealandica)[209] and phloem feeding green peach aphids (Myzus persicae)[210] were observed to die after feeding on Ricinus communis 76 was identified as the responsible toxin. The presence of 76 in the phloem of R. communis indicated a possible role for the toxin in defense of the plant against aphids [210]. 

Barber, G.A. The enzymic synthesis of uridine diphosphate L-rhamnose Fed. Am. Soc. Exptl. Biol. (1963). Baron, R.L. and F.E. Guthrie Study of sugars found in tobacco as affected by green peach aphid, Myzus per-sicae (Sulzer) Ann. Entomol. Soc. America 52 (1959) 257. 

Cheng, H.H. and W.A. Court Effects of green peach aphid, Myzus persicae (Sulzer), on certain chemical constituents of flue-cured tobacco Tob. Sci. 21 (1977) 134-135. Cheng, T.Y. Induction of indoleacetic acid synthetases in tobacco pith explants Plant Physiol. 50 (1972) 723-727. 

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