Добрый день. Уважаемые форумчане, коллеги и наставники прошу совета у вас. Имеется 2.5 га теплицы из 1,5 га гидропонике а 1 га на почеве сорт пинк парадайс салата сегодня при обходе обнаружил 8 растении с симптомами табачной мозаики, капнул глубже и решил пообщаться с коллегами в регионах оказалось что 80% тепличных хозяйствах имеется заражение прочёл массу литературу но все ответа не нашёл. Думаю использовать фармйод с молочным обортом
В Германии обнаружен новый для Европы вирус томата. Инфицированы 7 хозяйств общей площадью более 25 га. Подробнее на английском.
First report of tomato brown rugose fruit virus infecting tomato in Germany
In July 2018, unusual fruit and leaf symptoms were observed in numerous greenhouses cultivating tomatoes commercially in the Lower Rhine region of North-Rhine Westphalia, Germany. In total, more than 25 ha of greenhouse tomatoes were affected. New Disease Reports, an international online peer-reviewed journal published by the British Society for Plant Pathology (BSPP), reports on these matters.
It's the first report of ToBRFV in Germany, in Europe and outside countries of the Near East. In total ToBRFV has been confirmed in 7 greenhouses with tomatoes in North Rhine-Westphalia. Additionally, one further greenhouse with tomatoes is suspected to be infested. This is the first finding of ToBRFV in Germany.
The infested tomato plants in this nurseries were used for tomato fruit production. Eradication measures are in progress, including clearing of the greenhouses of all tomato plants, destruction of the whole plant material, disinfection of all greenhouse surfaces and all objects that were involved in tomato production and the material that was used in the clearance of the greenhouses.
This tobamovirus is a risk to European horticulture. ToBRFV was discovered in Jordan in 2015, but already occurred in Israel in 2014. ToBRFV infects tomato plants and leads to mosaic staining of the leaves as well as discoloration and deformations of the fruits.
The virus can affect up to 100 % of a stock. The available resistance genes in conventional tomato varieties against other tobamoviruses are ineffective against ToBRFV. So far, too little is known about the virus to exclude possible damage on other host plants. The virus can establish in greenhouse cultures of tomatoes in Germany and other EU Member States. Outdoors, potential host plants occur, which can serve at least as reservoir for new infections. Because of its high damaging potential for tomato production, ToBRFV poses a significant phytosanitary risk for Germany and other EU Member States.
Foliar symptoms included chlorosis, mosaic with dark green bulges and narrowing Fruit symptoms consisted of yellow spots, often concentrated around the calyx with occasional rugose symptoms rendering the fruits non-marketable.
Publication date : 1/11/2019
Попалась полезная статья на английском с хорошими картинками, но переводить ее сейчас некогда. Учитывая, что ссылки со временем перестают открываться, переношу ее сюда полностью.
Lower leaf interveinal chlorosis: Magnesium deficiency of tomato
Tomatoes commonly develop symptoms of interveinal chlorosis (yellowing) on the lower leaves due to magnesium (Mg) deficiency. This e-GRO Alert highlights the symptomological development of Mg deficiency to help you identify the problem and discusses management procedures.
by Brian E. Whipker - [email protected], Josh Henry, Paul Cockson and W. Garrett Owen - [email protected]
Often times, lower leaf interveinal chlorosis appears on tomato plants (Fig. 1), which is a classical symptom of a magnesium (Mg) deficiency. Tomatoes commonly develop symptoms over time because they have a high demand for Mg and the high levels of calcium (Ca) supplied to plants to avoid blossom end rot can limit (antagonize) the plant’s ability to acquire adequate levels of Mg.
Figure 1. Typical symptoms of a magnesium deficiency include interveinal chlorosis (yellowing) of the lower leaves of tomatoes. Photo by: Brian Whipker.
Symptomology of Mg deficiency on tomatoes occurs on the lower, older leaves. That is because Mg is a mobile element, and if Mg is limited in the plant, it will be translocated from the mature leaves to the new tissue. Typical initial symptomology is lower leaf interveinal chlorosis (yellowing). Next, a few areas of the leaves develop a slight interveinal chlorosis (Fig. 2), which intensifies over time (Fig. 3). With advanced symptoms, necrotic spotting (Fig. 4) and dark purplish black spotting (Fig. 5) will develop. In general, the leaf tissue sufficiency range for Mg with tomatoes should be between 0.25 to 0.50%.
Figure 2. The initial symptom of a magnesium deficiency begins as faint interveinal chlorosis (yellowing) of the lower leaves. Photo by: Brian Whipker.
Magnesium deficiency can be confused with another problem common on the lower leaves of tomatoes. Tomatoes can also develop lower leaf necrosis as a result of excessively low substrate pH. Generally, when the substrate drops below pH 5.5, both iron (Fe) and manganese (Mn) can be taken up by the plant in toxic quantities (Fig. 6). Thus, it is important to confirm your diagnosis with a substrate and/or foliar tissue test.
Figure 3. Interveinal chlorosis (yellowing) expands between the veins of the older leaves and tan spotting develops as magnesium deficiency symptoms progress. Photo by: Brian Whipker.
The correction for a Mg deficiency is easy. Epsom salts (magnesium sulfate) can be applied at the rate of 2 pounds per 100 gallons of water (2.4 kg/1000L). Apply this as a 10% flow through leaching irrigation. This will stop the progression of symptoms but will not reverse any necrotic spotting. For areas which lack sufficient Mg in their irrigation water and Mg is not part of the regular fertilization program (e.g. 20-10-20 does NOT contain Mg), monthly applications of Epsom salts at a rate of 1 pound per 100 gallons of water (1.2 kg/1000L) is the common production practice to ‘green up’ plants and avoid deficiencies.
Figure 4. Necrotic (brown) spotting on the lower leaves is observed under advanced magnesium deficiency. Photo by: Brian Whipker.
Magnesium deficiencies commonly occur on tomatoes. Knowing how to identify the disorder will improve crop management.
Figure 5. On tomatoes, spotting can appear as a dark purplish-black coloration. This can be confused with low substrate pH induced iron and/or manganese toxicity symptoms. Photo by: Brian Whipker.
Figure 6. Low substrate pH induced iron and/or manganese toxicity mimics an advanced magnesium deficiency problem. Photo by: Brian Whipker.
Source: e-GRO Alert
Publication date : 1/16/2019