{"id":170,"date":"2014-07-30T17:44:27","date_gmt":"2014-07-30T21:44:27","guid":{"rendered":"http:\/\/site.extension.uga.edu\/pecan\/?p=170"},"modified":"2014-07-30T17:58:53","modified_gmt":"2014-07-30T21:58:53","slug":"managing-black-aphids","status":"publish","type":"post","link":"https:\/\/site.extension.uga.edu\/pecan\/2014\/07\/managing-black-aphids\/","title":{"rendered":"Managing Black Aphids"},"content":{"rendered":"

Black aphids can be one of the most difficult pecan pests to manage because they often slip in, do their damage, and are gone before you know they are there. For this reason, they require pretty intensive scouting on susceptible varieties like Schley, Sumner, Oconee, and Gloria Grande. Anyone growing these varieties probably needs to check for black aphids at least twice a week from July through August. There is normally a flight of black aphids that comes through sometime in early June. These are usually winged adults that come through to feed, damage a few leaves and condition the foliage for the later generations (black aphids reproduce more and develop more rapidly on damaged foliage).<\/p>\n

\"black<\/a><\/p>\n

The late season generations, which we see during this time of year, can develop into a problem very quickly, causing the characteristic yellow spotting, developing necrosis, and eventual loss of leaves.\u00a0Tolerance for black aphids at this time of year should be very low because August is a critical month for both the current season’s crop and the crop potential for next year. Thus,\u00a0trees should be kept as stress free as possible at this time. For this reason, it is recommended that pecan trees are sprayed when only\u00a015% of the terminals sampled have more than one black aphid adult with nymphs present on a compound\u00a0leaf.<\/p>\n

\"black<\/a>\"black<\/a><\/p>\n

Black Aphid Adult\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 Black Aphid Nymphs<\/strong><\/p>\n

We have several good materials labeled for black aphids. The recently released products Closer and\u00a0Beleaf have given excellent control with good residual.\u00a0Fulfill also works well if applied before populations get too heavy. \u00a0If mites are found in the orchard\u00a0at the same time as aphids, Nexter is a good choice. Another less expensive alternative is the highest labeled rate of imidacloprid. I have seen this work well in some orchards and less so in others.\u00a0Those cases of poor results with foliar-applied\u00a0imidacloprid\u00a0may be related to high pH of the water in the tank, which can break down imidacloprid, or to UV light exposure when spraying in the middle of the day. At any rate, some may choose to include Chlorpyrifos along with the imidacloprid\u00a0to get a quick knockdown of\u00a0black aphids. If\u00a0you choose to spray Chlorpyrifos, be aware that you may see a rebound of aphids and mites in the coming weeks.<\/p>\n

ProGibb applied at 10 oz\/acre \u00a0earlier in the season before damage is visible can mask the symptoms of yellowing that occur from black aphid feeding. This prevents the development of high populations in later generations since they do not reproduce as well on undamaged foliage. It is probably too late in the season at this point to get the benefit from ProGibb if you already have black aphid damage present but if ProGibb is applied be sure and use the 4% material. There is another formulation that has a higher ai, which can affect the return crop.<\/p>\n","protected":false},"excerpt":{"rendered":"

Black aphids can be one of the most difficult pecan pests to manage because they often slip in, do their damage, and are gone before you know they are there. For this reason, they require pretty intensive scouting on susceptible varieties like Schley, Sumner, Oconee, and Gloria Grande. Anyone growing these varieties probably needs to […]<\/p>\n","protected":false},"author":55,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-170","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/posts\/170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/users\/55"}],"replies":[{"embeddable":true,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/comments?post=170"}],"version-history":[{"count":4,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/posts\/170\/revisions"}],"predecessor-version":[{"id":177,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/posts\/170\/revisions\/177"}],"wp:attachment":[{"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/media?parent=170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/categories?post=170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/site.extension.uga.edu\/pecan\/wp-json\/wp\/v2\/tags?post=170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}