We have heard of and observed increasing potato leaf hopper (PLH) damage in many areas across OH last week. PLH feed similar to aphids, by piercing and sucking on plants causing stunting, thinning and yellowing of alfalfa, often called hopperburn. To scout fields, use a sweep net—a single sweep sample is a set of 10 sweeps, and choose 5-10 different field locations. Treatment is needed if the number of PLH (adults and nymphs) caught a sweep sample is equal to the height of alfalfa. For glandular haired or PLH-resistant alfalfa, the threshold is multiplied by 3. For older, thinning alfalfa stands, thresholds can also be increased, while newer stands (e.g. new seedings or 1st year) are more vulnerable. See Ohio State University Extension Bulletin 545, Control of Insect Pests of Field Crops (https://agcrops.osu.edu/publications/control-insect-pests-field-crops-bulletin-545), for those insecticides labeled for potato leafhopper, or for all insecticides labeled on alfalfa.
Don’t get burned by hopper burn: Potato Leafhoppers reaching high levels in alfalfa and forage
Crop Observation and Recommendation Network
C.O.R.N. Newsletter is a summary of crop observations, related information, and appropriate recommendations for Ohio crop producers and industry. C.O.R.N. Newsletter is produced by the Ohio State University Extension Agronomy Team, state specialists at The Ohio State University and the Ohio Agricultural Research and Development Center (OARDC). C.O.R.N. Newsletter questions are directed to Extension and OARDC state specialists and associates at Ohio State.
"Tumesikia na kuona ongezeko la uharibifu wa ""plum leaf hopper"" katika maeneo mengi kote Ohio wiki iliyopita." "Mimea ya ""Hippohippus"" huchoma na kuvuja kwa njia ya njia ya ""Hippohippus,"" na hivyo kusababisha stunting, thinning na yellowing ya alfalfa, mara nyingi huitwa ""hopperburn.""" Kwa ajili ya kuchunguza mashamba, tumia mtandao wa kufuta - sampuli moja ya kufuta ni seti ya 10 ya kufuta, na kuchagua maeneo 5-10 tofauti ya shamba. Matibabu yanahitajika ikiwa idadi ya PLH (wakubwa na nymphs) iliyochukuliwa katika sampuli ya kufuta ni sawa na urefu wa alfalfa. Kwa alfalfa ya glandular na ya PLH, kiwango cha juu kinazidishwa na 3. Kwa ajili ya zamani, thinning alfalfa inasimama, mipaka pia inaweza kuongezeka, wakati inasimama mpya (kwa mfano Kwa hivyo, mbegu mpya au mbegu za mwaka wa kwanza ni hatari zaidi. "Kama ilivyoelezwa katika jarida la Ohio State University Extension Bulletin 545, ""Udhibiti wa wadudu wadudu wa mazao ya shamba"" (https: ag.gov.edu) kwa dawa za kuua wadudu zilizowekwa kwenye mbegu za viazi, au kwa dawa zote za kuua wadudu zilizowekwa kwenye alfalfa." Usichomwe na kuchomwa na hopper: Potato Leafhoppers kufikia viwango vya juu katika alfalfa na malisho Crop Observation na Mapendekezo ya Mtandao C.O.R.N. Barua ya habari ni muhtasari wa uchunguzi wa mazao, habari zinazohusiana, na mapendekezo sahihi kwa wazalishaji wa mazao ya Ohio na tasnia. C.O.R.N. Gazeti la habari linatolewa na Chuo Kikuu cha Ohio Extension Agronomy Team, wataalamu wa serikali katika Chuo Kikuu cha Jimbo la Ohio na Kituo cha Utafiti na Maendeleo ya Kilimo cha Ohio (OARDC). C.O.R.N. Maelezo ya habari ya jarida la habari yanatolewa kwa wataalamu wa hali ya OARDC na washirika katika Jimbo la Ohio.