The rate of translocation varies according to the type of crop, but is always less than 50% of applied Fe to a given leaf or leaflet. Therefore, under field conditions, growers need to apply foliar sprays of Fe more than once to provide adequate Fe to the developing canopy. Boron (B) deficiency is a common problem for groundnut production, especially on highly weathered sandy soils. When grown in such soils it is highly advisable to apply B. Higher rates of B2 can however, also be toxic to plants. Boron deficiency in groundnuts is often associated with fruit damage and has been termed as ‘hallow heart’. It reduces the quality of the pod and the value of the crop.
Severe B deficiency can result in split stems and roots, shortened internodes, terminal death, and extensive secondary branching. Leaves may be dark green and mottled with few or no well developed pods. Boron deficiency can be corrected by either soil or foliar applications. These can be mixed with herbicides or fungicides. Biotic constraints to yield include insect pests, diseases and weeds. The impact of pests and diseases in the SAT reflects the use of locally grown cultivars which, apart from having a poor yield potential, also lack resistance to diseases and insects.
The most serious pests in India include Spodoptera
litura, Aproaerema modicella, and Helicoverpa armigera. In certain areas the
two-spotted spider mite (Tetranychus sp.) is widespread and can cause severe
yield losses, particularly when groundnuts are grown in light, sandy soils that
become drought stressed. The populations of spider mite can build up rapidly,
particularly if insecticide sprays kill natural predators.
OZSTAR has the best roasters of various capacities to give you the perfectly roasted peanuts! We also provide additional equipment for flavouring and seasoning the nuts. OZSTAR also provides additional flavoring and seasoning equipment for nuts We manufacture different capacity to suit demand. This stainless steel is of high quality and can be controlled from the touch screen control panel. Intercellular feeders such as aphids (Aphis craccivora), thrips (Frankliniella sp.) and leafhoppers (Empoasca sp.), and soil pests like termites (Microtermes sp. and Odontotermes sp.) and white grubs (Eulepida marshona and Lachnosterna sp.) are also important pests in some of the semi-arid regions.
Groundnuts are often attacked by fungi, bacteria and
viruses. The most common fungal pathogens known to drastically reduce yield
and/or quality of the crop include leaf spots (Cercospora sp.), rusts (Puccinia
arachidis) and toxin producing Aspergillus flavus. Aflatoxin contamination is a
major health risk in many groundnut producing countries. The soil-borne
diseases like stem rot (Sclerotium rolfsii) and pod rot (Phythium sp.) also
pose serious problems in some areas. Root-knot nematodes (Meloidogyne sp.) are
also an important yield limiting factor.
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